Desktop aura: Use the X11 clipboard

ui/base/clipboard/clipboard_aurax11.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/clipboard/clipboard.h"
 
+#include <X11/extensions/Xfixes.h>
+#include <X11/Xatom.h>
 #include <list>
+#include <set>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
+#include "base/i18n/icu_string_conversions.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/singleton.h"
+#include "base/message_pump_aurax11.h"
+#include "base/message_pump_observer.h"
+#include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/clipboard/custom_data_helper.h"
+#include "ui/base/x/x11_atom_cache.h"
+#include "ui/base/x/x11_util.h"
+
 #include "ui/gfx/size.h"
 
 namespace ui {
 
 namespace {
+
+const char kChromeSelection[] = "CHROME_SELECTION";
+const char kClipboard[] = "CLIPBOARD";
+const char kMimeTypeBitmap[] = "image/bmp";
 const char kMimeTypeFilename[] = "chromium/filename";
-const char kMimeTypeBitmap[] = "image/bmp";
+const char kMimeTypeMozillaURL[] = "text/x-moz-url";
 const char kMimeTypeWebkitSmartPaste[] = "chromium/x-webkit-paste";
-const size_t kMaxClipboardSize = 1;
-
-// Clipboard data format used by AuraClipboard.
-enum AuraClipboardFormat {
-  TEXT      = 1 << 0,
-  HTML      = 1 << 1,
-  RTF       = 1 << 2,
-  BOOKMARK  = 1 << 3,
-  BITMAP    = 1 << 4,
-  CUSTOM    = 1 << 5,
-  WEB       = 1 << 6,
+const char kMultiple[] = "MULTIPLE";
+const char kString[] = "STRING";
+const char kTargets[] = "TARGETS";
+const char kText[] = "TEXT";
+const char kUtf8String[] = "UTF8_STRING";
+
+const char* kAtomsToCache[] = {
+  kChromeSelection,
+  kClipboard,
+  kMimeTypeBitmap,
+  kMimeTypeFilename,
+  kMimeTypeMozillaURL,
+  kMimeTypeWebkitSmartPaste,
+  kMultiple,
+  kString,
+  kTargets,
+  kText,
+  kUtf8String,
+  NULL
 };
 
-// ClipboardData contains data copied to the Clipboard for a variety of formats.
-// It mostly just provides APIs to cleanly access and manipulate this data.
-class ClipboardData {
+///////////////////////////////////////////////////////////////////////////////
+
+// Returns a list of all text atoms that we handle.
+std::vector< ::Atom> GetTextAtomsFrom(const X11AtomCache* atom_cache) {
+  std::vector< ::Atom> atoms;
+  atoms.push_back(atom_cache->GetAtom(kUtf8String));
+  atoms.push_back(atom_cache->GetAtom(kString));
+  atoms.push_back(atom_cache->GetAtom(kText));
+  return atoms;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+// Uses the XFixes API to provide sequence numbers for GetSequenceNumber().
+class SelectionChangeObserver : public base::MessagePumpObserver {
  public:
-  ClipboardData()
-      : bitmap_data_(),
-        web_smart_paste_(false),
-        format_(0) {}
-
-  virtual ~ClipboardData() {}
-
-  // Bitmask of AuraClipboardFormat types.
-  const int format() const { return format_; }
-
-  const std::string& text() const { return text_; }
-  void set_text(const std::string& text) {
-    text_ = text;
-    format_ |= TEXT;
-  }
-
-  const std::string& markup_data() const { return markup_data_; }
-  void set_markup_data(const std::string& markup_data) {
-    markup_data_ = markup_data;
-    format_ |= HTML;
-  }
-
-  const std::string& rtf_data() const { return rtf_data_; }
-  void SetRTFData(const std::string& rtf_data) {
-    rtf_data_ = rtf_data;
-    format_ |= RTF;
-  }
-
-  const std::string& url() const { return url_; }
-  void set_url(const std::string& url) {
-    url_ = url;
-    format_ |= HTML;
-  }
-
-  const std::string& bookmark_title() const { return bookmark_title_; }
-  void set_bookmark_title(const std::string& bookmark_title) {
-    bookmark_title_ = bookmark_title;
-    format_ |= BOOKMARK;
-  }
-
-  const std::string& bookmark_url() const { return bookmark_url_; }
-  void set_bookmark_url(const std::string& bookmark_url) {
-    bookmark_url_ = bookmark_url;
-    format_ |= BOOKMARK;
-  }
-
-  uint8_t* bitmap_data() const { return bitmap_data_.get(); }
-  const gfx::Size& bitmap_size() const { return bitmap_size_; }
-  void SetBitmapData(const char* pixel_data, const char* size_data) {
-    bitmap_size_ = *reinterpret_cast<const gfx::Size*>(size_data);
-
-    // We assume 4-byte pixel data.
-    size_t bitmap_data_len = 4 * bitmap_size_.width() * bitmap_size_.height();
-    bitmap_data_.reset(new uint8_t[bitmap_data_len]);
-    memcpy(bitmap_data_.get(), pixel_data, bitmap_data_len);
-    format_ |= BITMAP;
-  }
-
-  const std::string& custom_data_format() const { return custom_data_format_; }
-  const std::string& custom_data_data() const { return custom_data_data_; }
-  void SetCustomData(const std::string& data_format,
-                     const std::string& data_data) {
-    if (data_data.size() == 0) {
-      custom_data_data_.clear();
-      custom_data_format_.clear();
-      return;
+  static SelectionChangeObserver* GetInstance();
+
+  uint64 clipboard_sequence_number() const {
+    return clipboard_sequence_number_;
+  }
+  uint64 primary_sequence_number() const { return primary_sequence_number_; }
+
+ private:
+  friend struct DefaultSingletonTraits<SelectionChangeObserver>;
+
+  SelectionChangeObserver();
+  ~SelectionChangeObserver();
+
+  // Overridden from base::MessagePumpObserver:
+  virtual base::EventStatus WillProcessEvent(
+      const base::NativeEvent& event) OVERRIDE;
+  virtual void DidProcessEvent(
+      const base::NativeEvent& event) OVERRIDE {}
+
+  int event_base_;
+  Atom clipboard_atom_;
+  uint64 clipboard_sequence_number_;
+  uint64 primary_sequence_number_;
+
+  DISALLOW_COPY_AND_ASSIGN(SelectionChangeObserver);
+};
+
+SelectionChangeObserver::SelectionChangeObserver()
+    : event_base_(-1),
+      clipboard_atom_(None),
+      clipboard_sequence_number_(0),
+      primary_sequence_number_(0) {
+  int ignored;
+  if (XFixesQueryExtension(GetXDisplay(), &event_base_, &ignored)) {
+    clipboard_atom_ = XInternAtom(GetXDisplay(), kClipboard, false);
+    XFixesSelectSelectionInput(GetXDisplay(), GetX11RootWindow(),
+                               clipboard_atom_,
+                               XFixesSetSelectionOwnerNotifyMask |
+                               XFixesSelectionWindowDestroyNotifyMask |
+                               XFixesSelectionClientCloseNotifyMask);
+    // This seems to be semi-optional. For some reason, registering for any
+    // selection notify events seems to subscribe us to events for both the
+    // primary and the clipboard buffers. Register anyway just to be safe.
+    XFixesSelectSelectionInput(GetXDisplay(), GetX11RootWindow(),
+                               XA_PRIMARY,
+                               XFixesSetSelectionOwnerNotifyMask |
+                               XFixesSelectionWindowDestroyNotifyMask |
+                               XFixesSelectionClientCloseNotifyMask);
+
+    base::MessagePumpAuraX11::Current()->AddObserver(this);
+  }
+}
+
+SelectionChangeObserver::~SelectionChangeObserver() {
+  // We are a singleton; we will outlive our message pump.
+}
+
+SelectionChangeObserver* SelectionChangeObserver::GetInstance() {
+  return Singleton<SelectionChangeObserver>::get();
+}
+
+base::EventStatus SelectionChangeObserver::WillProcessEvent(
+    const base::NativeEvent& event) {
+  if (event->type == event_base_ + XFixesSelectionNotify) {
+    XFixesSelectionNotifyEvent* ev =
+        reinterpret_cast<XFixesSelectionNotifyEvent*>(event);
+    if (ev->selection == clipboard_atom_) {
+      clipboard_sequence_number_++;
+    } else if (ev->selection == XA_PRIMARY) {
+      primary_sequence_number_++;
+    } else {
+      DLOG(ERROR) << "Unexpected selection atom: " << ev->selection;
     }
-    custom_data_data_ = data_data;
-    custom_data_format_ = data_format;
-    format_ |= CUSTOM;
-  }
-
-  bool web_smart_paste() const { return web_smart_paste_; }
-  void set_web_smart_paste(bool web_smart_paste) {
-    web_smart_paste_ = web_smart_paste;
-    format_ |= WEB;
-  }
+  }
+  return base::EVENT_CONTINUE;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+// Represents the selection in different data formats. Binary data passed in is
+// assumed to be allocated with new char[], and is owned by FormatMap.
+class FormatMap {
+ public:
+  // Our internal data store, which we only expose through iterators.
+  typedef std::map< ::Atom, std::pair<char*, size_t> > InternalMap;
+  typedef std::map< ::Atom, std::pair<char*, size_t> >::const_iterator
+      const_iterator;
+
+  FormatMap();
+  ~FormatMap();
+
+  // Adds the selection in the format |atom|. Ownership of |data| is passed to
+  // us.
+  void Insert(::Atom atom, char* data, size_t size);
+
+  // Pass through to STL map. Only allow non-mutation access.
+  const_iterator begin() const { return data_.begin(); }
+  const_iterator end() const { return data_.end(); }
+  const_iterator find(::Atom atom) const { return data_.find(atom); }
+  size_t size() const { return data_.size(); }
 
  private:
-  // Plain text in UTF8 format.
-  std::string text_;
-
-  // HTML markup data in UTF8 format.
-  std::string markup_data_;
-  std::string url_;
-
-  // RTF data.
-  std::string rtf_data_;
-
-  // Bookmark title in UTF8 format.
-  std::string bookmark_title_;
-  std::string bookmark_url_;
-
-  // Filenames.
-  std::vector<std::string> files_;
-
-  // Bitmap images.
-  scoped_array<uint8_t> bitmap_data_;
-  gfx::Size bitmap_size_;
-
-  // Data with custom format.
-  std::string custom_data_format_;
-  std::string custom_data_data_;
-
-  // WebKit smart paste data.
-  bool web_smart_paste_;
-
-  int format_;
-
-  DISALLOW_COPY_AND_ASSIGN(ClipboardData);
+  InternalMap data_;
+
+  DISALLOW_COPY_AND_ASSIGN(FormatMap);
 };
 
-// Platform clipboard implementation for Aura. This handles things like format
-// conversion, versioning of clipboard items etc. The goal is to roughly provide
-// a substitute to platform clipboards on other platforms such as GtkClipboard
-// on gtk or winapi clipboard on win.
-class AuraClipboard {
+FormatMap::FormatMap() {}
+
+FormatMap::~FormatMap() {
+  // WriteText() inserts the same pointer multiple times for different
+  // representations; we need to dedupe it.
+  std::set<char*> to_delete;
+  for (InternalMap::iterator it = data_.begin(); it != data_.end(); ++it)
+    to_delete.insert(it->second.first);
+
+  for (std::set<char*>::iterator it = to_delete.begin(); it != to_delete.end();
+       ++it) {
+    delete [] *it;
+  }
+}
+
+void FormatMap::Insert(::Atom atom, char* data, size_t size) {
+  DCHECK(data_.find(atom) == data_.end());
+  data_.insert(std::make_pair(atom, std::make_pair(data, size)));
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+// Represents a list of possible return types. Copy constructable.
+class TargetList {
  public:
-  AuraClipboard() {}
-
-  ~AuraClipboard() {
-    Clear();
-  }
-
-  void Clear() {
-    STLDeleteContainerPointers(data_list_.begin(), data_list_.end());
-    data_list_.clear();
-  }
-
-  // Returns the number of entries currently in the clipboard stack.
-  size_t GetNumClipboardEntries() {
-    return data_list_.size();
-  }
-
-  // Returns the data currently on the top of the clipboard stack, NULL if the
-  // clipboard stack is empty.
-  const ClipboardData* GetData() const {
-    if (data_list_.empty())
-      return NULL;
-    return data_list_.front();
-  }
-
-  // Returns true if the data on top of the clipboard stack has format |format|
-  // or another format that can be converted to |format|.
-  bool IsFormatAvailable(AuraClipboardFormat format) const {
-    switch (format) {
-      case TEXT:
-        return HasFormat(TEXT) || HasFormat(BOOKMARK);
-      default:
-        return HasFormat(format);
-    }
-  }
-
-  // Reads text from the data at the top of clipboard stack.
-  void ReadText(string16* result) const {
-    std::string utf8_result;
-    ReadAsciiText(&utf8_result);
-    *result = UTF8ToUTF16(utf8_result);
-  }
-
-  // Reads ascii text from the data at the top of clipboard stack.
-  void ReadAsciiText(std::string* result) const {
-    result->clear();
-    const ClipboardData* data = GetData();
-    if (!data)
-      return;
-    if (HasFormat(TEXT))
-      *result = data->text();
-    else if (HasFormat(HTML))
-      *result = data->markup_data();
-    else if (HasFormat(BOOKMARK))
-      *result = data->bookmark_url();
-  }
-
-  // Reads HTML from the data at the top of clipboard stack.
-  void ReadHTML(string16* markup,
-                std::string* src_url,
-                uint32* fragment_start,
-                uint32* fragment_end) const {
-    markup->clear();
-    if (src_url)
-      src_url->clear();
-    *fragment_start = 0;
-    *fragment_end = 0;
-
-    if (!HasFormat(HTML))
-      return;
-
-    const ClipboardData* data = GetData();
-    *markup = UTF8ToUTF16(data->markup_data());
-    *src_url = data->url();
-
-    *fragment_start = 0;
-    DCHECK_LE(markup->length(), kuint32max);
-    *fragment_end = static_cast<uint32>(markup->length());
-  }
-
-  // Reads RTF from the data at the top of clipboard stack.
-  void ReadRTF(std::string* result) const {
-    result->clear();
-    const ClipboardData* data = GetData();
-    if (!HasFormat(RTF))
-      return;
-
-    *result = data->rtf_data();
-  }
-
-  // Reads image from the data at the top of clipboard stack.
-  SkBitmap ReadImage() const {
-    SkBitmap img;
-    if (!HasFormat(BITMAP))
-      return img;
-
-    const ClipboardData* data = GetData();
-    const gfx::Size size = data->bitmap_size();
-    uint8_t* bitmap = data->bitmap_data();
-    img.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height(), 0);
-    img.allocPixels();
-    img.eraseARGB(0, 0, 0, 0);
-    memcpy(img.getPixels(), bitmap, size.width() * size.height() * 4);
-    return img;
-  }
-
-  // Reads data of type |type| from the data at the top of clipboard stack.
-  void ReadCustomData(const string16& type, string16* result) const {
-    result->clear();
-    const ClipboardData* data = GetData();
-    if (!HasFormat(CUSTOM))
-      return;
-
-    ui::ReadCustomDataForType(data->custom_data_data().c_str(),
-        data->custom_data_data().size(),
-        type, result);
-  }
-
-  // Reads bookmark from the data at the top of clipboard stack.
-  void ReadBookmark(string16* title, std::string* url) const {
-    title->clear();
-    url->clear();
-    if (!HasFormat(BOOKMARK))
-      return;
-
-    const ClipboardData* data = GetData();
-    *title = UTF8ToUTF16(data->bookmark_title());
-    *url = data->bookmark_url();
-  }
-
-  void ReadData(const std::string& type, std::string* result) const {
-    result->clear();
-    const ClipboardData* data = GetData();
-    if (!HasFormat(CUSTOM) || type != data->custom_data_format())
-      return;
-
-    *result = data->custom_data_data();
-  }
-
-  // Writes |data| to the top of the clipboard stack.
-  void WriteData(ClipboardData* data) {
-    DCHECK(data);
-    AddToListEnsuringSize(data);
-  }
+  typedef std::vector< ::Atom> AtomVector;
+
+  TargetList(const AtomVector& target_list, X11AtomCache* atom_cache);
+
+  bool ContainsText() const;
+  bool ContainsFormat(const Clipboard::FormatType& format_type) const;
+  bool ContainsAtom(::Atom atom) const;
 
  private:
-  // True if the data on top of the clipboard stack has format |format|.
-  bool HasFormat(AuraClipboardFormat format) const {
-    const ClipboardData* data = GetData();
-    if (!data)
-      return false;
-
-    return data->format() & format;
-  }
-
-  void AddToListEnsuringSize(ClipboardData* data) {
-    DCHECK(data);
-    data_list_.push_front(data);
-
-    // If the size of list becomes more than the maximum allowed, we delete the
-    // last element.
-    if (data_list_.size() > kMaxClipboardSize) {
-      ClipboardData* last = data_list_.back();
-      data_list_.pop_back();
-      delete last;
-    }
-  }
-
-  // Stack containing various versions of ClipboardData.
-  std::list<ClipboardData*> data_list_;
-
-  DISALLOW_COPY_AND_ASSIGN(AuraClipboard);
+  AtomVector target_list_;
+  X11AtomCache* atom_cache_;
 };
 
-AuraClipboard* aura_clipboard = NULL;
-
-AuraClipboard* GetClipboard() {
-  if (!aura_clipboard)
-    aura_clipboard = new AuraClipboard();
-  return aura_clipboard;
-}
-
-void DeleteClipboard() {
-  if (aura_clipboard)
-    delete aura_clipboard;
-  aura_clipboard = NULL;
-}
-
-// Helper class to build a ClipboardData object and write it to clipboard.
-class ClipboardDataBuilder {
+TargetList::TargetList(const AtomVector& target_list,
+                       X11AtomCache* atom_cache)
+    : target_list_(target_list),
+      atom_cache_(atom_cache) {
+}
+
+bool TargetList::ContainsText() const {
+  std::vector< ::Atom> atoms = GetTextAtomsFrom(atom_cache_);
+  for (std::vector< ::Atom>::const_iterator it = atoms.begin();
+       it != atoms.end(); ++it) {
+    if (ContainsAtom(*it))
+      return true;
+  }
+
+  return false;
+}
+
+bool TargetList::ContainsFormat(
+    const Clipboard::FormatType& format_type) const {
+  ::Atom atom = atom_cache_->GetAtom(format_type.ToString().c_str());
+  return ContainsAtom(atom);
+}
+
+bool TargetList::ContainsAtom(::Atom atom) const {
+  return find(target_list_.begin(), target_list_.end(), atom)
+      != target_list_.end();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+// A holder for data with optional X11 deletion semantics.
+class SelectionData {
  public:
-  static void CommitToClipboard() {
-    DCHECK(current_data_);
-    GetClipboard()->WriteData(current_data_);
-    current_data_ = NULL;
-  }
-
-  static void WriteText(const char* text_data, size_t text_len) {
-    ClipboardData* data = GetCurrentData();
-    data->set_text(std::string(text_data, text_len));
-  }
-
-  static void WriteHTML(const char* markup_data,
-                        size_t markup_len,
-                        const char* url_data,
-                        size_t url_len) {
-    ClipboardData* data = GetCurrentData();
-    data->set_markup_data(std::string(markup_data, markup_len));
-    data->set_url(std::string(url_data, url_len));
-  }
-
-  static void WriteRTF(const char* rtf_data, size_t rtf_len) {
-    ClipboardData* data = GetCurrentData();
-    data->SetRTFData(std::string(rtf_data, rtf_len));
-  }
-
-  static void WriteBookmark(const char* title_data,
-                            size_t title_len,
-                            const char* url_data,
-                            size_t url_len) {
-    ClipboardData* data = GetCurrentData();
-    data->set_bookmark_title(std::string(title_data, title_len));
-    data->set_bookmark_url(std::string(url_data, url_len));
-  }
-
-  static void WriteWebSmartPaste() {
-    ClipboardData* data = GetCurrentData();
-    data->set_web_smart_paste(true);
-  }
-
-  static void WriteBitmap(const char* pixel_data, const char* size_data) {
-    ClipboardData* data = GetCurrentData();
-    data->SetBitmapData(pixel_data, size_data);
-  }
-
-  static void WriteData(const std::string& format,
-                        const char* data_data,
-                        size_t data_len) {
-    ClipboardData* data = GetCurrentData();
-    data->SetCustomData(format, std::string(data_data, data_len));
-  }
+  // |atom_cache| is still owned by caller.
+  explicit SelectionData(X11AtomCache* atom_cache);
+  ~SelectionData();
+
+  ::Atom type() const { return type_; }
+  char* data() const { return data_; }
+  size_t size() const { return size_; }
+
+  void Set(::Atom type, char* data, size_t size, bool owned);
+
+  // If |type_| is a string type, convert the data to UTF8 and return it.
+  std::string GetText() const;
+
+  // Assigns the raw data to the string.
+  void AssignTo(std::string* result) const;
 
  private:
-  static ClipboardData* GetCurrentData() {
-    if (!current_data_)
-      current_data_ = new ClipboardData;
-    return current_data_;
-  }
-
-  static ClipboardData* current_data_;
+  ::Atom type_;
+  char* data_;
+  size_t size_;
+  bool owned_;
+
+  X11AtomCache* atom_cache_;
 };
 
-ClipboardData* ClipboardDataBuilder::current_data_ = NULL;
+SelectionData::SelectionData(X11AtomCache* atom_cache)
+    : type_(None),
+      data_(NULL),
+      size_(0),
+      owned_(false),
+      atom_cache_(atom_cache) {
+}
+
+SelectionData::~SelectionData() {
+  if (owned_)
+    XFree(data_);
+}
+
+void SelectionData::Set(::Atom type, char* data, size_t size, bool owned) {
+  if (owned_)
+    XFree(data_);
+
+  type_ = type;
+  data_ = data;
+  size_ = size;
+  owned_ = owned;
+}
+
+std::string SelectionData::GetText() const {
+  if (type_ == atom_cache_->GetAtom(kUtf8String) ||
+      type_ == atom_cache_->GetAtom(kText)) {
+    return std::string(data_, size_);
+  } else if (type_ == atom_cache_->GetAtom(kString)) {
+    std::string result;
+    base::ConvertToUtf8AndNormalize(std::string(data_, size_),
+                                    base::kCodepageLatin1,
+                                    &result);
+    return result;
+  } else {
+    // BTW, I looked at COMPOUND_TEXT, and there's no way we're going to
+    // support that. Yuck.
+    NOTREACHED();
+    return std::string();
+  }
+}
+
+void SelectionData::AssignTo(std::string* result) const {
+  result->assign(data_, size_);
+}
 
 }  // namespace
 
+///////////////////////////////////////////////////////////////////////////////
+
+// I would love for the FormatType to really be a wrapper around an X11 ::Atom,
+// but there are a few problems. Chromeos unit tests spawn a new X11 server for
+// each test, so Atom numeric values don't persist across tests. We could still
+// maybe deal with that if we didn't have static accessor methods everywhere.
+
 Clipboard::FormatType::FormatType() {
 }
 
 Clipboard::FormatType::FormatType(const std::string& native_format)
     : data_(native_format) {
 }
 
 Clipboard::FormatType::~FormatType() {
 }
 
 std::string Clipboard::FormatType::Serialize() const {
   return data_;
 }
 
 // static
 Clipboard::FormatType Clipboard::FormatType::Deserialize(
     const std::string& serialization) {
   return FormatType(serialization);
 }
 
 bool Clipboard::FormatType::Equals(const FormatType& other) const {
   return data_ == other.data_;
 }
 
-Clipboard::Clipboard() {
+///////////////////////////////////////////////////////////////////////////////
+// Clipboard::AuraX11Details
+
+// Private implementation of our X11 integration. Keeps X11 headers out of the
+// majority of chrome, which break badly.
+class Clipboard::AuraX11Details : public base::MessagePumpDispatcher {
+ public:
+  AuraX11Details();
+  ~AuraX11Details();
+
+  X11AtomCache* atom_cache() { return &atom_cache_; }
+
+  // Returns the X11 type that we pass to various XSelection functions for the
+  // given buffer.
+  ::Atom LookupSelectionForBuffer(Buffer buffer) const;
+
+  // Finds the FormatMap for the incoming selection atom.
+  FormatMap* LookupStorageForAtom(::Atom atom);
+
+  // As we need to collect all the data types before we tell X11 that we own a
+  // particular selection, we create a temporary clipboard mapping that
+  // InsertMapping writes to. Then we commit it in TakeOwnershipOfSelection,
+  // where we save it in one of the clipboard data slots.
+  void CreateNewClipboardData();
+
+  // Inserts a mapping into clipboard_data_.
+  void InsertMapping(const std::string& key, char* data, size_t data_len);
+
+  // Moves the temporary |clipboard_data_| to the long term data storage for
+  // |buffer|.
+  void TakeOwnershipOfSelection(Buffer buffer);
+
+  // Returns the first of |types| offered by the current selection holder in
+  // |data_out|, or returns NULL if none of those types are available.
+  //
+  // If the selection holder is us, this call is synchronous and we pull
+  // the data out of |clipboard_selection_| or |primary_selection_|. If the
+  // selection holder is some other window, we spin up a nested message loop
+  // and do the asynchronous dance with whatever application is holding the
+  // selection.
+  scoped_ptr<SelectionData> RequestAndWaitForTypes(
+      Buffer buffer,
+      const std::vector< ::Atom>& types);
+
+  // Retrieves the list of possible data types the current clipboard owner has.
+  //
+  // If the selection holder is us, this is synchronous, otherwise this runs a
+  // blocking message loop.
+  TargetList WaitAndGetTargetsList(Buffer buffer);
+
+  // Does the work of requesting |target| from |selection_name|, spinning up
+  // the nested message loop, and reading the resulting data back. |out_data|
+  // is allocated with the X allocator and must be freed with
+  // XFree(). |out_data_bytes| is the length in machine chars, while
+  // |out_data_items| is the length in |out_type| items.
+  bool PerformBlockingConvertSelection(::Atom selection_name,
+                                       ::Atom target,
+                                       unsigned char** out_data,
+                                       size_t* out_data_bytes,
+                                       size_t* out_data_items,
+                                       ::Atom* out_type);
+
+  // Returns a list of all text atoms that we handle.
+  std::vector< ::Atom> GetTextAtoms() const;
+
+  // Returns a vector with a |format| converted to an X11 atom.
+  std::vector< ::Atom> GetAtomsForFormat(const Clipboard::FormatType& format);
+
+  // Clears a certain data buffer.
+  void Clear(Buffer buffer);
+
+ private:
+  // Called by Dispatch to handle specific types of events.
+  void HandleSelectionRequest(const XSelectionRequestEvent& event);
+  void HandleSelectionNotify(const XSelectionEvent& event);
+  void HandleSelectionClear(const XSelectionClearEvent& event);
+  void HandlePropertyNotify(const XPropertyEvent& event);
+
+  // Overridden from base::MessagePumpDispatcher:
+  virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
+
+  // Temporary target map that we write to during DispatchObects.
+  scoped_ptr<FormatMap> clipboard_data_;
+
+  // The current value of our clipboard and primary selections. These should be
+  // non-NULL when we own the selection.
+  scoped_ptr<FormatMap> clipboard_selection_;
+  scoped_ptr<FormatMap> primary_selection_;
+
+  // Our X11 state.
+  Display* x_display_;
+  ::Window x_root_window_;
+
+  // Input-only window used as a selection owner.
+  ::Window x_window_;
+
+  // True if we're currently running a nested message loop, waiting for data to
+  // come back from the X server.
+  bool in_nested_loop_;
+
+  // Data to the current XConvertSelection request. Used for error detection;
+  // we verify it on the return message.
+  ::Atom current_selection_;
+  ::Atom current_target_;
+
+  // The property in the returning SelectNotify message is used to signal
+  // success. If None, our request failed somehow. If equal to the property
+  // atom that we sent in the XConvertSelection call, we can read that property
+  // on |x_window_| for the requested data.
+  ::Atom returned_property_;
+
+  // Called to terminate the nested message loop.
+  base::Closure quit_closure_;
+
+  X11AtomCache atom_cache_;
+
+  DISALLOW_COPY_AND_ASSIGN(AuraX11Details);
+};
+
+Clipboard::AuraX11Details::AuraX11Details()
+    : x_display_(GetXDisplay()),
+      x_root_window_(DefaultRootWindow(x_display_)),
+      in_nested_loop_(false),
+      atom_cache_(x_display_, kAtomsToCache) {
+  // We don't know all possible MIME types at compile time.
+  atom_cache_.allow_uncached_atoms();
+
+  x_window_ = XCreateWindow(
+      x_display_, x_root_window_,
+      -100, -100, 10, 10,  // x, y, width, height
+      0,                   // border width
+      CopyFromParent,      // depth
+      InputOnly,
+      CopyFromParent,      // visual
+      0,
+      NULL);
+  XStoreName(x_display_, x_window_, "Chromium clipboard");
+  XSelectInput(x_display_, x_window_, PropertyChangeMask);
+
+  base::MessagePumpAuraX11::Current()->AddDispatcherForWindow(this, x_window_);
+}
+
+Clipboard::AuraX11Details::~AuraX11Details() {
+  base::MessagePumpAuraX11::Current()->RemoveDispatcherForWindow(x_window_);
+
+  XDestroyWindow(x_display_, x_window_);
+}
+
+::Atom Clipboard::AuraX11Details::LookupSelectionForBuffer(
+    Buffer buffer) const {
+  if (buffer == BUFFER_STANDARD)
+    return atom_cache_.GetAtom(kClipboard);
+  else
+    return XA_PRIMARY;
+}
+
+FormatMap* Clipboard::AuraX11Details::LookupStorageForAtom(::Atom atom) {
+  if (atom == XA_PRIMARY)
+    return primary_selection_.get();
+  else if (atom == atom_cache_.GetAtom(kClipboard))
+    return clipboard_selection_.get();
+  else
+    return NULL;
+}
+
+void Clipboard::AuraX11Details::CreateNewClipboardData() {
+  clipboard_data_.reset(new FormatMap);
+}
+
+void Clipboard::AuraX11Details::InsertMapping(const std::string& key,
+                                              char* data,
+                                              size_t data_len) {
+  ::Atom atom_key = atom_cache_.GetAtom(key.c_str());
+  clipboard_data_->Insert(atom_key, data, data_len);
+}
+
+void Clipboard::AuraX11Details::TakeOwnershipOfSelection(Buffer buffer) {
+  // Tell the X server that we are now the selection owner.
+  ::Atom xselection = LookupSelectionForBuffer(buffer);
+  XSetSelectionOwner(x_display_, xselection, x_window_, CurrentTime);
+
+  if (XGetSelectionOwner(x_display_, xselection) == x_window_) {
+    // The X server agrees that we are the selection owner. Commit our data.
+    if (buffer == BUFFER_STANDARD)
+      clipboard_selection_ = clipboard_data_.Pass();
+    else
+      primary_selection_ = clipboard_data_.Pass();
+  }
+}
+
+scoped_ptr<SelectionData> Clipboard::AuraX11Details::RequestAndWaitForTypes(
+    Buffer buffer,
+    const std::vector< ::Atom>& types) {
+  ::Atom selection_name = LookupSelectionForBuffer(buffer);
+  if (XGetSelectionOwner(x_display_, selection_name) == x_window_) {
+    // We can local fastpath instead of playing the nested message loop game
+    // with the X server.
+    FormatMap* format_map = LookupStorageForAtom(selection_name);
+    DCHECK(format_map);
+
+    for (std::vector< ::Atom>::const_iterator it = types.begin();
+         it != types.end(); ++it) {
+      FormatMap::const_iterator format_map_it = format_map->find(*it);
+      if (format_map_it != format_map->end()) {
+        scoped_ptr<SelectionData> data_out(new SelectionData(&atom_cache_));
+        data_out->Set(format_map_it->first, format_map_it->second.first,
+                      format_map_it->second.second, false);
+        return data_out.Pass();
+      }
+    }
+  } else {
+    TargetList targets = WaitAndGetTargetsList(buffer);
+
+    for (std::vector< ::Atom>::const_iterator it = types.begin();
+         it != types.end(); ++it) {
+      unsigned char* data = NULL;
+      size_t data_bytes = 0;
+      ::Atom type = None;
+      if (targets.ContainsAtom(*it) &&
+          PerformBlockingConvertSelection(selection_name,
+                                          *it,
+                                          &data,
+                                          &data_bytes,
+                                          NULL,
+                                          &type) &&
+          type == *it) {
+        scoped_ptr<SelectionData> data_out(new SelectionData(&atom_cache_));
+        data_out->Set(type, (char*)data, data_bytes, true);
+        return data_out.Pass();
+      }
+    }
+  }
+
+  return scoped_ptr<SelectionData>();
+}
+
+TargetList Clipboard::AuraX11Details::WaitAndGetTargetsList(
+    Buffer buffer) {
+  ::Atom selection_name = LookupSelectionForBuffer(buffer);
+  std::vector< ::Atom> out;
+  if (XGetSelectionOwner(x_display_, selection_name) == x_window_) {
+    // We can local fastpath and return the list of local targets.
+    FormatMap* format_map = LookupStorageForAtom(selection_name);
+    DCHECK(format_map);
+
+    for (FormatMap::const_iterator it = format_map->begin();
+         it != format_map->end(); ++it) {
+      out.push_back(it->first);
+    }
+  } else {
+    unsigned char* data = NULL;
+    size_t out_data_items = 0;
+    ::Atom out_type = None;
+
+    if (PerformBlockingConvertSelection(selection_name,
+                                        atom_cache_.GetAtom(kTargets),
+                                        &data,
+                                        NULL,
+                                        &out_data_items,
+                                        &out_type)) {
+      ::Atom* atom_array = reinterpret_cast< ::Atom*>(data);
+      for (size_t i = 0; i < out_data_items; ++i)
+        out.push_back(atom_array[i]);
+
+      XFree(data);
+    } else {
+      // There was no target list. Most Java apps doesn't offer a TARGETS list,
+      // even though they AWT to. They will offer individual text types if you
+      // ask. If this is the case we attempt to make sense of the contents as
+      // text. This is pretty unfortunate since it means we have to actually
+      // copy the data to see if it is available, but at least this path
+      // shouldn't be hit for conforming programs.
+      std::vector< ::Atom> types = GetTextAtoms();
+      for (std::vector< ::Atom>::const_iterator it = types.begin();
+           it != types.end(); ++it) {
+        ::Atom type = None;
+        if (PerformBlockingConvertSelection(selection_name,
+                                            *it,
+                                            NULL,
+                                            NULL,
+                                            NULL,
+                                            &type) &&
+            type == *it) {
+          out.push_back(*it);
+        }
+      }
+    }
+  }
+
+  return TargetList(out, &atom_cache_);
+}
+
+bool Clipboard::AuraX11Details::PerformBlockingConvertSelection(
+    ::Atom selection_name,
+    ::Atom target,
+    unsigned char** out_data,
+    size_t* out_data_bytes,
+    size_t* out_data_items,
+    ::Atom* out_type) {
+  // The name of the property we're asking to be set on |x_window_|.
+  ::Atom property_to_set = atom_cache_.GetAtom(kChromeSelection);
+
+  XConvertSelection(x_display_,
+                    selection_name,
+                    target,
+                    property_to_set,
+                    x_window_,
+                    CurrentTime);
+
+  // Now that we've thrown our message off to the X11 server, we block waiting
+  // for a response.
+  MessageLoopForUI* loop = MessageLoopForUI::current();
+  MessageLoop::ScopedNestableTaskAllower allow_nested(loop);
+  base::RunLoop run_loop(base::MessagePumpAuraX11::Current());
+
+  current_selection_ = selection_name;
+  current_target_ = target;
+  in_nested_loop_ = true;
+  quit_closure_ = run_loop.QuitClosure();
+  run_loop.Run();
+  in_nested_loop_ = false;
+  current_selection_ = None;
+  current_target_ = None;
+
+  if (returned_property_ != property_to_set)
+    return false;
+
+  // Retrieve the data from our window.
+  unsigned long nitems = 0;
+  unsigned long nbytes = 0;
+  Atom prop_type = None;
+  int prop_format = 0;
+  unsigned char* property_data = NULL;
+  if (XGetWindowProperty(x_display_,
+                         x_window_,
+                         returned_property_,
+                         0, 0x1FFFFFFF /* MAXINT32 / 4 */, False,
+                         AnyPropertyType, &prop_type, &prop_format,
+                         &nitems, &nbytes, &property_data) != Success) {
+    return false;
+  }
+
+  if (prop_type == None)
+    return false;
+
+  if (out_data)
+    *out_data = property_data;
+
+  if (out_data_bytes) {
+    // So even though we should theoretically have nbytes (and we can't
+    // pass NULL there), we need to manually calculate the byte length here
+    // because nbytes always returns zero.
+    switch (prop_format) {
+      case 8:
+        *out_data_bytes = nitems;
+        break;
+      case 16:
+        *out_data_bytes = sizeof(short) * nitems;
+        break;
+      case 32:
+        *out_data_bytes = sizeof(long) * nitems;
+        break;
+      default:
+        NOTREACHED();
+        break;
+    }
+  }
+
+  if (out_data_items)
+    *out_data_items = nitems;
+
+  if (out_type)
+    *out_type = prop_type;
+
+  return true;
+}
+
+std::vector< ::Atom> Clipboard::AuraX11Details::GetTextAtoms() const {
+  return GetTextAtomsFrom(&atom_cache_);
+}
+
+std::vector< ::Atom> Clipboard::AuraX11Details::GetAtomsForFormat(
+    const Clipboard::FormatType& format) {
+  std::vector< ::Atom> atoms;
+  atoms.push_back(atom_cache_.GetAtom(format.ToString().c_str()));
+  return atoms;
+}
+
+void Clipboard::AuraX11Details::Clear(Buffer buffer) {
+  ::Atom selection_name = LookupSelectionForBuffer(buffer);
+  if (XGetSelectionOwner(x_display_, selection_name) == x_window_)
+    XSetSelectionOwner(x_display_, selection_name, None, CurrentTime);
+
+  if (buffer == BUFFER_STANDARD)
+    clipboard_selection_.reset();
+  else
+    primary_selection_.reset();
+}
+
+void Clipboard::AuraX11Details::HandleSelectionRequest(
+    const XSelectionRequestEvent& event) {
+  // Incrementally build our selection. By default this is a refusal, and we'll
+  // override the parts indicating success in the different cases.
+  XEvent reply;
+  reply.xselection.type = SelectionNotify;
+  reply.xselection.requestor = event.requestor;
+  reply.xselection.selection = event.selection;
+  reply.xselection.target = event.target;
+  reply.xselection.property = None;  // Indicates failure
+  reply.xselection.time = event.time;
+
+  // Get the proper selection.
+  FormatMap* format_map = LookupStorageForAtom(event.selection);
+  if (format_map) {
+    ::Atom targets_atom = atom_cache_.GetAtom(kTargets);
+    if (event.target == targets_atom) {
+      std::vector< ::Atom> targets;
+      targets.push_back(targets_atom);
+      for (FormatMap::const_iterator it = format_map->begin();
+           it != format_map->end(); ++it) {
+        targets.push_back(it->first);
+      }
+
+      XChangeProperty(x_display_, event.requestor, event.property, XA_ATOM, 32,
+                      PropModeReplace,
+                      reinterpret_cast<unsigned char*>(&targets.front()),
+                      targets.size());
+      reply.xselection.property = event.property;
+    } else if (event.target == atom_cache_.GetAtom(kMultiple)) {
+      // TODO(erg): Theoretically, the spec claims I'm supposed to handle the
+      // MULTIPLE case, but I haven't seen it in the wild yet.
+      NOTIMPLEMENTED();
+    } else {
+      // Try to find the data type in map.
+      FormatMap::const_iterator it = format_map->find(event.target);
+      if (it != format_map->end()) {
+        XChangeProperty(x_display_, event.requestor, event.property,
+                        event.target, 8,
+                        PropModeReplace,
+                        reinterpret_cast<unsigned char*>(it->second.first),
+                        it->second.second);
+        reply.xselection.property = event.property;
+      }
+      // I would put error logging here, but GTK ignores TARGETS and spams us
+      // looking for its own internal types.
+    }
+  } else {
+    DLOG(ERROR) << "Requested on a selection we don't support: "
+                << XGetAtomName(x_display_, event.selection);
+  }
+
+  // Send off the reply.
+  XSendEvent(x_display_, event.requestor, False, 0, &reply);
+}
+
+void Clipboard::AuraX11Details::HandleSelectionNotify(
+    const XSelectionEvent& event) {
+  if (!in_nested_loop_) {
+    // This shouldn't happen; we're not waiting on the X server for data, but
+    // any client can send any message...
+    return;
+  }
+
+  if (current_selection_ == event.selection &&
+      current_target_ == event.target) {
+    returned_property_ = event.property;
+  } else {
+    // I am assuming that if some other client sent us a message after we've
+    // asked for data, but it's malformed, we should just treat as if they sent
+    // us an error message.
+    returned_property_ = None;
+  }
+
+  quit_closure_.Run();
+}
+
+void Clipboard::AuraX11Details::HandleSelectionClear(
+    const XSelectionClearEvent& event) {
+  DLOG(ERROR) << "SelectionClear";
+
+  // TODO(erg): If we receive a SelectionClear event while we're handling data,
+  // we need to delay clearing.
+}
+
+void Clipboard::AuraX11Details::HandlePropertyNotify(
+    const XPropertyEvent& event) {
+  // TODO(erg): Must handle PropertyNotify events on our |x_window_| as part
+  // of receiving data during paste.
+}
+
+bool Clipboard::AuraX11Details::Dispatch(const base::NativeEvent& event) {
+  XEvent* xev = event;
+
+  switch (xev->type) {
+    case SelectionRequest:
+      HandleSelectionRequest(xev->xselectionrequest);
+      break;
+    case SelectionNotify:
+      HandleSelectionNotify(xev->xselection);
+      break;
+    case SelectionClear:
+      HandleSelectionClear(xev->xselectionclear);
+      break;
+    case PropertyNotify:
+      HandlePropertyNotify(xev->xproperty);
+      break;
+    default:
+      break;
+  }
+
+  return true;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Clipboard
+
+Clipboard::Clipboard()
+    : aurax11_details_(new AuraX11Details) {
   DCHECK(CalledOnValidThread());
-  // Make sure clipboard is created.
-  GetClipboard();
 }
 
 Clipboard::~Clipboard() {
   DCHECK(CalledOnValidThread());
-  DeleteClipboard();
+
+  // TODO(erg): We need to do whatever the equivalent of
+  // gtk_clipboard_store(clipboard_) is here. When we shut down, we want the
+  // current selection to live on.
 }
 
 void Clipboard::WriteObjects(Buffer buffer, const ObjectMap& objects) {
   DCHECK(CalledOnValidThread());
   DCHECK(IsValidBuffer(buffer));
+
+  aurax11_details_->CreateNewClipboardData();
   for (ObjectMap::const_iterator iter = objects.begin();
        iter != objects.end(); ++iter) {
     DispatchObject(static_cast<ObjectType>(iter->first), iter->second);
   }
-  ClipboardDataBuilder::CommitToClipboard();
+
+  aurax11_details_->TakeOwnershipOfSelection(buffer);
 }
 
 bool Clipboard::IsFormatAvailable(const FormatType& format,
                                   Buffer buffer) const {
   DCHECK(CalledOnValidThread());
   DCHECK(IsValidBuffer(buffer));
-  AuraClipboard* clipboard = GetClipboard();
-  if (GetPlainTextFormatType().Equals(format) ||
-      GetUrlFormatType().Equals(format))
-    return clipboard->IsFormatAvailable(TEXT);
-  else if (GetHtmlFormatType().Equals(format))
-    return clipboard->IsFormatAvailable(HTML);
-  else if (GetRtfFormatType().Equals(format))
-    return clipboard->IsFormatAvailable(RTF);
-  else if (GetBitmapFormatType().Equals(format))
-    return clipboard->IsFormatAvailable(BITMAP);
-  else if (GetWebKitSmartPasteFormatType().Equals(format))
-    return clipboard->IsFormatAvailable(WEB);
-  else {
-    const ClipboardData* data = clipboard->GetData();
-    if (data && data->custom_data_format() == format.ToString())
-      return true;
-  }
-  return false;
+
+  TargetList target_list = aurax11_details_->WaitAndGetTargetsList(buffer);
+  return target_list.ContainsFormat(format);
 }
 
 void Clipboard::Clear(Buffer buffer) {
   DCHECK(CalledOnValidThread());
   DCHECK(IsValidBuffer(buffer));
-  AuraClipboard* clipboard = GetClipboard();
-  clipboard->Clear();
+  aurax11_details_->Clear(buffer);
 }
 
 void Clipboard::ReadAvailableTypes(Buffer buffer, std::vector<string16>* types,
     bool* contains_filenames) const {
   DCHECK(CalledOnValidThread());
   if (!types || !contains_filenames) {
     NOTREACHED();
     return;
   }
 
+  TargetList target_list = aurax11_details_->WaitAndGetTargetsList(buffer);
+
   types->clear();
+
+  if (target_list.ContainsText())
+    types->push_back(UTF8ToUTF16(kMimeTypeText));
+  if (target_list.ContainsFormat(GetHtmlFormatType()))
+    types->push_back(UTF8ToUTF16(kMimeTypeHTML));
+  if (target_list.ContainsFormat(GetRtfFormatType()))
+    types->push_back(UTF8ToUTF16(kMimeTypeRTF));
+  if (target_list.ContainsFormat(GetBitmapFormatType()))
+    types->push_back(UTF8ToUTF16(kMimeTypePNG));
   *contains_filenames = false;
-  if (IsFormatAvailable(GetPlainTextFormatType(), buffer))
-    types->push_back(UTF8ToUTF16(GetPlainTextFormatType().ToString()));
-  if (IsFormatAvailable(GetHtmlFormatType(), buffer))
-    types->push_back(UTF8ToUTF16(GetHtmlFormatType().ToString()));
-  if (IsFormatAvailable(GetRtfFormatType(), buffer))
-    types->push_back(UTF8ToUTF16(GetRtfFormatType().ToString()));
-  if (IsFormatAvailable(GetBitmapFormatType(), buffer))
-    types->push_back(UTF8ToUTF16(GetBitmapFormatType().ToString()));
-
-  AuraClipboard* clipboard = GetClipboard();
-  if (clipboard->IsFormatAvailable(CUSTOM) && clipboard->GetData()) {
-    ui::ReadCustomDataTypes(clipboard->GetData()->custom_data_data().c_str(),
-        clipboard->GetData()->custom_data_data().size(), types);
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      buffer,
+      aurax11_details_->GetAtomsForFormat(GetWebCustomDataFormatType())));
+  if (!data.get())
+    return;
+
+  ReadCustomDataTypes(data->data(), data->size(), types);
+}
+
+void Clipboard::ReadText(Buffer buffer, string16* result) const {
+  DCHECK(CalledOnValidThread());
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      buffer, aurax11_details_->GetTextAtoms()));
+  if (data.get()) {
+    std::string text = data->GetText();
+    *result = UTF8ToUTF16(text);
   }
 }
 
-void Clipboard::ReadText(Buffer buffer, string16* result) const {
-  DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadText(result);
-}
-
 void Clipboard::ReadAsciiText(Buffer buffer, std::string* result) const {
   DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadAsciiText(result);
-}
-
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      buffer, aurax11_details_->GetTextAtoms()));
+  if (data.get())
+    result->assign(data->GetText());
+}
+
+// TODO(estade): handle different charsets.
+// TODO(port): set *src_url.
 void Clipboard::ReadHTML(Buffer buffer,
                          string16* markup,
                          std::string* src_url,
                          uint32* fragment_start,
                          uint32* fragment_end) const {
   DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadHTML(markup, src_url, fragment_start, fragment_end);
+  markup->clear();
+  if (src_url)
+    src_url->clear();
+  *fragment_start = 0;
+  *fragment_end = 0;
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      buffer, aurax11_details_->GetAtomsForFormat(GetHtmlFormatType())));
+  if (!data.get())
+    return;
+
+  // If the data starts with 0xFEFF, i.e., Byte Order Mark, assume it is
+  // UTF-16, otherwise assume UTF-8.
+  if (data->size() >= 2 &&
+      reinterpret_cast<const uint16_t*>(data->data())[0] == 0xFEFF) {
+    markup->assign(reinterpret_cast<const uint16_t*>(data->data()) + 1,
+                   (data->size() / 2) - 1);
+  } else {
+    UTF8ToUTF16(reinterpret_cast<const char*>(data->data()), data->size(),
+                markup);
+  }
+
+  // If there is a terminating NULL, drop it.
+  if (!markup->empty() && markup->at(markup->length() - 1) == '\0')
+    markup->resize(markup->length() - 1);
+
+  *fragment_start = 0;
+  DCHECK(markup->length() <= kuint32max);
+  *fragment_end = static_cast<uint32>(markup->length());
 }
 
 void Clipboard::ReadRTF(Buffer buffer, std::string* result) const {
   DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadRTF(result);
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      buffer, aurax11_details_->GetAtomsForFormat(GetRtfFormatType())));
+  if (data.get())
+    data->AssignTo(result);
 }
 
 SkBitmap Clipboard::ReadImage(Buffer buffer) const {
   DCHECK(CalledOnValidThread());
-  return GetClipboard()->ReadImage();
+  NOTIMPLEMENTED();
+  return SkBitmap();
 }
 
 void Clipboard::ReadCustomData(Buffer buffer,
                                const string16& type,
                                string16* result) const {
   DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadCustomData(type, result);
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      buffer,
+      aurax11_details_->GetAtomsForFormat(GetWebCustomDataFormatType())));
+  if (!data.get())
+    return;
+
+  ReadCustomDataForType(data->data(), data->size(), type, result);
 }
 
 void Clipboard::ReadBookmark(string16* title, std::string* url) const {
   DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadBookmark(title, url);
+  // TODO(erg): This was left NOTIMPLEMENTED() in the gtk port too.
+  NOTIMPLEMENTED();
 }
 
 void Clipboard::ReadData(const FormatType& format, std::string* result) const {
   DCHECK(CalledOnValidThread());
-  GetClipboard()->ReadData(format.ToString(), result);
+
+  scoped_ptr<SelectionData> data(aurax11_details_->RequestAndWaitForTypes(
+      BUFFER_STANDARD, aurax11_details_->GetAtomsForFormat(format)));
+  if (data.get())
+    data->AssignTo(result);
+}
+
+// When a URL is copied from a render view context menu (via "copy link
+// location", for example), we additionally stick it in the X clipboard. This
+// matches other linux browsers.
+void Clipboard::DidWriteURL(const std::string& utf8_text) {
+  DCHECK(CalledOnValidThread());
+
+  aurax11_details_->CreateNewClipboardData();
+  WriteText(utf8_text.c_str(), utf8_text.size());
+  aurax11_details_->TakeOwnershipOfSelection(BUFFER_SELECTION);
 }
 
 uint64 Clipboard::GetSequenceNumber(Buffer buffer) {
   DCHECK(CalledOnValidThread());
-  return GetClipboard()->GetNumClipboardEntries();
+  if (buffer == BUFFER_STANDARD)
+    return SelectionChangeObserver::GetInstance()->clipboard_sequence_number();
+  else
+    return SelectionChangeObserver::GetInstance()->primary_sequence_number();
 }
 
 void Clipboard::WriteText(const char* text_data, size_t text_len) {
-  ClipboardDataBuilder::WriteText(text_data, text_len);
+  char* data = new char[text_len];
+  memcpy(data, text_data, text_len);
+
+  aurax11_details_->InsertMapping(kMimeTypeText, data, text_len);
+  aurax11_details_->InsertMapping(kText, data, text_len);
+  aurax11_details_->InsertMapping(kString, data, text_len);
+  aurax11_details_->InsertMapping(kUtf8String, data, text_len);
 }
 
 void Clipboard::WriteHTML(const char* markup_data,
                           size_t markup_len,
                           const char* url_data,
                           size_t url_len) {
-  ClipboardDataBuilder::WriteHTML(markup_data, markup_len, url_data, url_len);
+  // TODO(estade): We need to expand relative links with |url_data|.
+  static const char* html_prefix = "<meta http-equiv=\"content-type\" "
+                                   "content=\"text/html; charset=utf-8\">";
+  size_t html_prefix_len = strlen(html_prefix);
+  size_t total_len = html_prefix_len + markup_len + 1;
+
+  char* data = new char[total_len];
+  snprintf(data, total_len, "%s", html_prefix);
+  memcpy(data + html_prefix_len, markup_data, markup_len);
+  // Some programs expect NULL-terminated data. See http://crbug.com/42624
+  data[total_len - 1] = '\0';
+
+  aurax11_details_->InsertMapping(kMimeTypeHTML, data, total_len);
 }
 
 void Clipboard::WriteRTF(const char* rtf_data, size_t data_len) {
-  ClipboardDataBuilder::WriteRTF(rtf_data, data_len);
+  WriteData(GetRtfFormatType(), rtf_data, data_len);
 }
 
 void Clipboard::WriteBookmark(const char* title_data,
                               size_t title_len,
                               const char* url_data,
                               size_t url_len) {
-  ClipboardDataBuilder::WriteBookmark(title_data, title_len, url_data, url_len);
-}
-
+  // Write as a mozilla url (UTF16: URL, newline, title).
+  string16 url = UTF8ToUTF16(std::string(url_data, url_len) + "\n");
+  string16 title = UTF8ToUTF16(std::string(title_data, title_len));
+  int data_len = 2 * (title.length() + url.length());
+
+  char* data = new char[data_len];
+  memcpy(data, url.data(), 2 * url.length());
+  memcpy(data + 2 * url.length(), title.data(), 2 * title.length());
+  aurax11_details_->InsertMapping(kMimeTypeMozillaURL, data, data_len);
+}
+
+// Write an extra flavor that signifies WebKit was the last to modify the
+// pasteboard. This flavor has no data.
 void Clipboard::WriteWebSmartPaste() {
-  ClipboardDataBuilder::WriteWebSmartPaste();
+  aurax11_details_->InsertMapping(kMimeTypeWebkitSmartPaste, NULL, 0);
 }
 
 void Clipboard::WriteBitmap(const char* pixel_data, const char* size_data) {
-  ClipboardDataBuilder::WriteBitmap(pixel_data, size_data);
+  // TODO(erg): I'm not sure if we should be writting BMP data here or
+  // not. It's what the GTK port does, but I'm not sure it's the right thing to
+  // do.
+  NOTIMPLEMENTED();
 }
 
 void Clipboard::WriteData(const FormatType& format,
                           const char* data_data,
                           size_t data_len) {
-  ClipboardDataBuilder::WriteData(format.ToString(), data_data, data_len);
+  // We assume that certain mapping types are only written by trusted code.
+  // Therefore we must upkeep their integrity.
+  if (format.Equals(GetBitmapFormatType()))
+    return;
+  char* data = new char[data_len];
+  memcpy(data, data_data, data_len);
+  aurax11_details_->InsertMapping(format.ToString(), data, data_len);
 }
 
 // static
 Clipboard::FormatType Clipboard::GetFormatType(
     const std::string& format_string) {
   return FormatType::Deserialize(format_string);
 }
 
 // static
 const Clipboard::FormatType& Clipboard::GetUrlFormatType() {
@@ skipping 52 matching lines @@
   return type;
 }
 
 // static
 const Clipboard::FormatType& Clipboard::GetWebCustomDataFormatType() {
   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kMimeTypeWebCustomData));
   return type;
 }
 
 }  // namespace ui