Move chrome.downloads out of experimental to dev

chrome/browser/download/download_extension_api.cc

Index: chrome/browser/download/download_extension_api.cc
diff --git a/chrome/browser/download/download_extension_api.cc b/chrome/browser/download/download_extension_api.cc
deleted file mode 100644
index b19c22c19b7bcf3c66c1b091a9f7e1de9c81d6bc..0000000000000000000000000000000000000000
--- a/chrome/browser/download/download_extension_api.cc
+++ /dev/null
@@ -1,1122 +0,0 @@
-// 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 "chrome/browser/download/download_extension_api.h"
-
-#include <algorithm>
-#include <cctype>
-#include <iterator>
-#include <set>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/callback.h"
-#include "base/json/json_writer.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/metrics/histogram.h"
-#include "base/stl_util.h"
-#include "base/string16.h"
-#include "base/string_split.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
-#include "base/values.h"
-#include "chrome/browser/browser_process.h"
-#include "chrome/browser/download/download_file_icon_extractor.h"
-#include "chrome/browser/download/download_query.h"
-#include "chrome/browser/download/download_service.h"
-#include "chrome/browser/download/download_service_factory.h"
-#include "chrome/browser/download/download_util.h"
-#include "chrome/browser/extensions/extension_event_names.h"
-#include "chrome/browser/extensions/extension_event_router.h"
-#include "chrome/browser/icon_loader.h"
-#include "chrome/browser/icon_manager.h"
-#include "chrome/browser/renderer_host/chrome_render_message_filter.h"
-#include "chrome/browser/ui/browser_list.h"
-#include "chrome/browser/ui/webui/web_ui_util.h"
-#include "content/public/browser/download_interrupt_reasons.h"
-#include "content/public/browser/download_item.h"
-#include "content/public/browser/download_save_info.h"
-#include "content/public/browser/render_process_host.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/browser/resource_dispatcher_host.h"
-#include "net/base/load_flags.h"
-#include "net/http/http_util.h"
-#include "net/url_request/url_request.h"
-
-using content::BrowserContext;
-using content::BrowserThread;
-using content::DownloadId;
-using content::DownloadItem;
-using content::DownloadManager;
-
-namespace download_extension_errors {
-
-// Error messages
-const char kGenericError[] = "I'm afraid I can't do that.";
-const char kIconNotFoundError[] = "Icon not found.";
-const char kInvalidDangerTypeError[] = "Invalid danger type";
-const char kInvalidFilterError[] = "Invalid query filter";
-const char kInvalidOperationError[] = "Invalid operation.";
-const char kInvalidOrderByError[] = "Invalid orderBy field";
-const char kInvalidQueryLimit[] = "Invalid query limit";
-const char kInvalidStateError[] = "Invalid state";
-const char kInvalidURLError[] = "Invalid URL.";
-const char kNotImplementedError[] = "NotImplemented.";
-
-}  // namespace download_extension_errors
-
-namespace {
-
-// Default icon size for getFileIcon() in pixels.
-const int  kDefaultIconSize = 32;
-
-// Parameter keys
-const char kBodyKey[] = "body";
-const char kBytesReceivedKey[] = "bytesReceived";
-const char kDangerAcceptedKey[] = "dangerAccepted";
-const char kDangerContent[] = "content";
-const char kDangerFile[] = "file";
-const char kDangerKey[] = "danger";
-const char kDangerSafe[] = "safe";
-const char kDangerUncommon[] = "uncommon";
-const char kDangerUrl[] = "url";
-const char kEndTimeKey[] = "endTime";
-const char kErrorKey[] = "error";
-const char kFileSizeKey[] = "fileSize";
-const char kFilenameKey[] = "filename";
-const char kFilenameRegexKey[] = "filenameRegex";
-const char kHeaderNameKey[] = "name";
-const char kHeaderValueKey[] = "value";
-const char kHeaderBinaryValueKey[] = "binaryValue";
-const char kHeadersKey[] = "headers";
-const char kIdKey[] = "id";
-const char kIncognito[] = "incognito";
-const char kLimitKey[] = "limit";
-const char kMethodKey[] = "method";
-const char kMimeKey[] = "mime";
-const char kOrderByKey[] = "orderBy";
-const char kPausedKey[] = "paused";
-const char kQueryKey[] = "query";
-const char kSaveAsKey[] = "saveAs";
-const char kSizeKey[] = "size";
-const char kStartTimeKey[] = "startTime";
-const char kStartedAfterKey[] = "startedAfter";
-const char kStartedBeforeKey[] = "startedBefore";
-const char kStateComplete[] = "complete";
-const char kStateInProgress[] = "in_progress";
-const char kStateInterrupted[] = "interrupted";
-const char kStateKey[] = "state";
-const char kTotalBytesKey[] = "totalBytes";
-const char kTotalBytesGreaterKey[] = "totalBytesGreater";
-const char kTotalBytesLessKey[] = "totalBytesLess";
-const char kUrlKey[] = "url";
-const char kUrlRegexKey[] = "urlRegex";
-
-// Note: Any change to the danger type strings, should be accompanied by a
-// corresponding change to {experimental.}downloads.json.
-const char* kDangerStrings[] = {
-  kDangerSafe,
-  kDangerFile,
-  kDangerUrl,
-  kDangerContent,
-  kDangerSafe,
-  kDangerUncommon,
-};
-COMPILE_ASSERT(arraysize(kDangerStrings) == content::DOWNLOAD_DANGER_TYPE_MAX,
-               download_danger_type_enum_changed);
-
-// Note: Any change to the state strings, should be accompanied by a
-// corresponding change to {experimental.}downloads.json.
-const char* kStateStrings[] = {
-  kStateInProgress,
-  kStateComplete,
-  kStateInterrupted,
-  NULL,
-  kStateInterrupted,
-};
-COMPILE_ASSERT(arraysize(kStateStrings) == DownloadItem::MAX_DOWNLOAD_STATE,
-               download_item_state_enum_changed);
-
-const char* DangerString(content::DownloadDangerType danger) {
-  DCHECK(danger >= 0);
-  DCHECK(danger < static_cast<content::DownloadDangerType>(
-      arraysize(kDangerStrings)));
-  return kDangerStrings[danger];
-}
-
-content::DownloadDangerType DangerEnumFromString(const std::string& danger) {
-  for (size_t i = 0; i < arraysize(kDangerStrings); ++i) {
-    if (danger == kDangerStrings[i])
-      return static_cast<content::DownloadDangerType>(i);
-  }
-  return content::DOWNLOAD_DANGER_TYPE_MAX;
-}
-
-const char* StateString(DownloadItem::DownloadState state) {
-  DCHECK(state >= 0);
-  DCHECK(state < static_cast<DownloadItem::DownloadState>(
-      arraysize(kStateStrings)));
-  DCHECK(state != DownloadItem::REMOVING);
-  return kStateStrings[state];
-}
-
-DownloadItem::DownloadState StateEnumFromString(const std::string& state) {
-  for (size_t i = 0; i < arraysize(kStateStrings); ++i) {
-    if ((kStateStrings[i] != NULL) && (state == kStateStrings[i]))
-      return static_cast<DownloadItem::DownloadState>(i);
-  }
-  return DownloadItem::MAX_DOWNLOAD_STATE;
-}
-
-bool ValidateFilename(const string16& filename) {
-  // TODO(benjhayden): More robust validation of filename.
-  if ((filename.find('/') != string16::npos) ||
-      (filename.find('\\') != string16::npos))
-    return false;
-  if (filename.size() >= 2u && filename[0] == L'.' && filename[1] == L'.')
-    return false;
-  return true;
-}
-
-scoped_ptr<base::DictionaryValue> DownloadItemToJSON(DownloadItem* item) {
-  base::DictionaryValue* json = new base::DictionaryValue();
-  json->SetInteger(kIdKey, item->GetId());
-  json->SetString(kUrlKey, item->GetOriginalUrl().spec());
-  json->SetString(kFilenameKey, item->GetFullPath().LossyDisplayName());
-  json->SetString(kDangerKey, DangerString(item->GetDangerType()));
-  if (item->GetDangerType() != content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS)
-    json->SetBoolean(kDangerAcceptedKey,
-        item->GetSafetyState() == DownloadItem::DANGEROUS_BUT_VALIDATED);
-  json->SetString(kStateKey, StateString(item->GetState()));
-  json->SetBoolean(kPausedKey, item->IsPaused());
-  json->SetString(kMimeKey, item->GetMimeType());
-  json->SetInteger(kStartTimeKey,
-      (item->GetStartTime() - base::Time::UnixEpoch()).InMilliseconds());
-  json->SetInteger(kBytesReceivedKey, item->GetReceivedBytes());
-  json->SetInteger(kTotalBytesKey, item->GetTotalBytes());
-  json->SetBoolean(kIncognito, item->IsOtr());
-  if (item->GetState() == DownloadItem::INTERRUPTED) {
-    json->SetInteger(kErrorKey, static_cast<int>(item->GetLastReason()));
-  } else if (item->GetState() == DownloadItem::CANCELLED) {
-    json->SetInteger(kErrorKey, static_cast<int>(
-        content::DOWNLOAD_INTERRUPT_REASON_USER_CANCELED));
-  }
-  // TODO(benjhayden): Implement endTime and fileSize.
-  // json->SetInteger(kEndTimeKey, -1);
-  json->SetInteger(kFileSizeKey, item->GetTotalBytes());
-  return scoped_ptr<base::DictionaryValue>(json);
-}
-
-class DownloadFileIconExtractorImpl : public DownloadFileIconExtractor {
- public:
-  DownloadFileIconExtractorImpl() {}
-
-  ~DownloadFileIconExtractorImpl() {}
-
-  virtual bool ExtractIconURLForPath(const FilePath& path,
-                                     IconLoader::IconSize icon_size,
-                                     IconURLCallback callback) OVERRIDE;
- private:
-  void OnIconLoadComplete(IconManager::Handle handle, gfx::Image* icon);
-
-  CancelableRequestConsumer cancelable_consumer_;
-  IconURLCallback callback_;
-};
-
-bool DownloadFileIconExtractorImpl::ExtractIconURLForPath(
-    const FilePath& path,
-    IconLoader::IconSize icon_size,
-    IconURLCallback callback) {
-  callback_ = callback;
-  IconManager* im = g_browser_process->icon_manager();
-  // The contents of the file at |path| may have changed since a previous
-  // request, in which case the associated icon may also have changed.
-  // Therefore, for the moment we always call LoadIcon instead of attempting
-  // a LookupIcon.
-  im->LoadIcon(
-      path, icon_size, &cancelable_consumer_,
-      base::Bind(&DownloadFileIconExtractorImpl::OnIconLoadComplete,
-                 base::Unretained(this)));
-  return true;
-}
-
-void DownloadFileIconExtractorImpl::OnIconLoadComplete(
-    IconManager::Handle handle,
-    gfx::Image* icon) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  std::string url;
-  if (icon)
-    url = web_ui_util::GetImageDataUrl(*icon->ToImageSkia());
-  callback_.Run(url);
-}
-
-IconLoader::IconSize IconLoaderSizeFromPixelSize(int pixel_size) {
-  switch (pixel_size) {
-    case 16: return IconLoader::SMALL;
-    case 32: return IconLoader::NORMAL;
-    default:
-      NOTREACHED();
-      return IconLoader::NORMAL;
-  }
-}
-
-typedef base::hash_map<std::string, DownloadQuery::FilterType> FilterTypeMap;
-
-void InitFilterTypeMap(FilterTypeMap& filter_types) {
-  filter_types[kBytesReceivedKey] =
-    DownloadQuery::FILTER_BYTES_RECEIVED;
-  filter_types[kDangerAcceptedKey] =
-    DownloadQuery::FILTER_DANGER_ACCEPTED;
-  filter_types[kFilenameKey] = DownloadQuery::FILTER_FILENAME;
-  filter_types[kFilenameRegexKey] =
-    DownloadQuery::FILTER_FILENAME_REGEX;
-  filter_types[kMimeKey] = DownloadQuery::FILTER_MIME;
-  filter_types[kPausedKey] = DownloadQuery::FILTER_PAUSED;
-  filter_types[kQueryKey] = DownloadQuery::FILTER_QUERY;
-  filter_types[kStartedAfterKey] = DownloadQuery::FILTER_STARTED_AFTER;
-  filter_types[kStartedBeforeKey] =
-    DownloadQuery::FILTER_STARTED_BEFORE;
-  filter_types[kStartTimeKey] = DownloadQuery::FILTER_START_TIME;
-  filter_types[kTotalBytesKey] = DownloadQuery::FILTER_TOTAL_BYTES;
-  filter_types[kTotalBytesGreaterKey] =
-      DownloadQuery::FILTER_TOTAL_BYTES_GREATER;
-  filter_types[kTotalBytesLessKey] =
-    DownloadQuery::FILTER_TOTAL_BYTES_LESS;
-  filter_types[kUrlKey] = DownloadQuery::FILTER_URL;
-  filter_types[kUrlRegexKey] = DownloadQuery::FILTER_URL_REGEX;
-}
-
-typedef base::hash_map<std::string, DownloadQuery::SortType> SortTypeMap;
-
-void InitSortTypeMap(SortTypeMap& sorter_types) {
-  sorter_types[kBytesReceivedKey] = DownloadQuery::SORT_BYTES_RECEIVED;
-  sorter_types[kDangerKey] = DownloadQuery::SORT_DANGER;
-  sorter_types[kDangerAcceptedKey] =
-    DownloadQuery::SORT_DANGER_ACCEPTED;
-  sorter_types[kFilenameKey] = DownloadQuery::SORT_FILENAME;
-  sorter_types[kMimeKey] = DownloadQuery::SORT_MIME;
-  sorter_types[kPausedKey] = DownloadQuery::SORT_PAUSED;
-  sorter_types[kStartTimeKey] = DownloadQuery::SORT_START_TIME;
-  sorter_types[kStateKey] = DownloadQuery::SORT_STATE;
-  sorter_types[kTotalBytesKey] = DownloadQuery::SORT_TOTAL_BYTES;
-  sorter_types[kUrlKey] = DownloadQuery::SORT_URL;
-}
-
-bool IsNotTemporaryDownloadFilter(const DownloadItem& item) {
-  return !item.IsTemporary();
-}
-
-void GetManagers(
-    Profile* profile,
-    bool include_incognito,
-    DownloadManager** manager, DownloadManager** incognito_manager) {
-  *manager = BrowserContext::GetDownloadManager(profile);
-  *incognito_manager = NULL;
-  if (include_incognito && profile->HasOffTheRecordProfile()) {
-    *incognito_manager = BrowserContext::GetDownloadManager(
-        profile->GetOffTheRecordProfile());
-  }
-}
-
-DownloadItem* GetActiveItemInternal(
-    Profile* profile,
-    bool include_incognito,
-    int id) {
-  DownloadManager* manager = NULL;
-  DownloadManager* incognito_manager = NULL;
-  GetManagers(profile, include_incognito, &manager, &incognito_manager);
-  DownloadItem* download_item = manager->GetActiveDownloadItem(id);
-  if (!download_item && incognito_manager)
-    download_item = incognito_manager->GetActiveDownloadItem(id);
-  return download_item;
-}
-
-}  // namespace
-
-bool DownloadsFunctionInterface::RunImplImpl(
-    DownloadsFunctionInterface* pimpl) {
-  CHECK(pimpl);
-  if (!pimpl->ParseArgs()) return false;
-  UMA_HISTOGRAM_ENUMERATION(
-      "Download.ApiFunctions", pimpl->function(), DOWNLOADS_FUNCTION_LAST);
-  return pimpl->RunInternal();
-}
-
-SyncDownloadsFunction::SyncDownloadsFunction(
-    DownloadsFunctionInterface::DownloadsFunctionName function)
-  : function_(function) {
-}
-
-SyncDownloadsFunction::~SyncDownloadsFunction() {}
-
-bool SyncDownloadsFunction::RunImpl() {
-  return DownloadsFunctionInterface::RunImplImpl(this);
-}
-
-DownloadsFunctionInterface::DownloadsFunctionName
-SyncDownloadsFunction::function() const {
-  return function_;
-}
-
-DownloadItem* SyncDownloadsFunction::GetActiveItem(int download_id) {
-  return GetActiveItemInternal(profile(), include_incognito(), download_id);
-}
-
-AsyncDownloadsFunction::AsyncDownloadsFunction(
-    DownloadsFunctionInterface::DownloadsFunctionName function)
-  : function_(function) {
-}
-
-AsyncDownloadsFunction::~AsyncDownloadsFunction() {}
-
-bool AsyncDownloadsFunction::RunImpl() {
-  return DownloadsFunctionInterface::RunImplImpl(this);
-}
-
-DownloadsFunctionInterface::DownloadsFunctionName
-AsyncDownloadsFunction::function() const {
-  return function_;
-}
-
-DownloadItem* AsyncDownloadsFunction::GetActiveItem(int download_id) {
-  return GetActiveItemInternal(profile(), include_incognito(), download_id);
-}
-
-DownloadsDownloadFunction::DownloadsDownloadFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_DOWNLOAD) {
-}
-
-DownloadsDownloadFunction::~DownloadsDownloadFunction() {}
-
-DownloadsDownloadFunction::IOData::IOData()
-  : save_as(false),
-    extra_headers(NULL),
-    method("GET"),
-    rdh(NULL),
-    resource_context(NULL),
-    render_process_host_id(0),
-    render_view_host_routing_id(0) {
-}
-
-DownloadsDownloadFunction::IOData::~IOData() {}
-
-bool DownloadsDownloadFunction::ParseArgs() {
-  base::DictionaryValue* options = NULL;
-  std::string url;
-  iodata_.reset(new IOData());
-  EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &options));
-  EXTENSION_FUNCTION_VALIDATE(options->GetString(kUrlKey, &url));
-  iodata_->url = GURL(url);
-  if (!iodata_->url.is_valid()) {
-    error_ = download_extension_errors::kInvalidURLError;
-    return false;
-  }
-
-  if (!iodata_->url.SchemeIs("data") &&
-      iodata_->url.GetOrigin() != GetExtension()->url().GetOrigin() &&
-      !GetExtension()->HasHostPermission(iodata_->url)) {
-    error_ = download_extension_errors::kInvalidURLError;
-    return false;
-  }
-
-  if (options->HasKey(kFilenameKey)) {
-    EXTENSION_FUNCTION_VALIDATE(options->GetString(
-        kFilenameKey, &iodata_->filename));
-    if (!ValidateFilename(iodata_->filename)) {
-      error_ = download_extension_errors::kGenericError;
-      return false;
-    }
-  }
-
-  if (options->HasKey(kSaveAsKey)) {
-    EXTENSION_FUNCTION_VALIDATE(options->GetBoolean(
-        kSaveAsKey, &iodata_->save_as));
-  }
-
-  if (options->HasKey(kMethodKey)) {
-    EXTENSION_FUNCTION_VALIDATE(options->GetString(
-        kMethodKey, &iodata_->method));
-  }
-
-  // It's ok to use a pointer to extra_headers without DeepCopy()ing because
-  // |args_| (which owns *extra_headers) is guaranteed to live as long as
-  // |this|.
-  if (options->HasKey(kHeadersKey)) {
-    EXTENSION_FUNCTION_VALIDATE(options->GetList(
-        kHeadersKey, &iodata_->extra_headers));
-  }
-
-  if (options->HasKey(kBodyKey)) {
-    EXTENSION_FUNCTION_VALIDATE(options->GetString(
-        kBodyKey, &iodata_->post_body));
-  }
-
-  if (iodata_->extra_headers != NULL) {
-    for (size_t index = 0; index < iodata_->extra_headers->GetSize(); ++index) {
-      base::DictionaryValue* header = NULL;
-      std::string name;
-      EXTENSION_FUNCTION_VALIDATE(iodata_->extra_headers->GetDictionary(
-            index, &header));
-      EXTENSION_FUNCTION_VALIDATE(header->GetString(
-            kHeaderNameKey, &name));
-      if (header->HasKey(kHeaderBinaryValueKey)) {
-        base::ListValue* binary_value = NULL;
-        EXTENSION_FUNCTION_VALIDATE(header->GetList(
-              kHeaderBinaryValueKey, &binary_value));
-        for (size_t char_i = 0; char_i < binary_value->GetSize(); ++char_i) {
-          int char_value = 0;
-          EXTENSION_FUNCTION_VALIDATE(binary_value->GetInteger(
-                char_i, &char_value));
-        }
-      } else if (header->HasKey(kHeaderValueKey)) {
-        std::string value;
-        EXTENSION_FUNCTION_VALIDATE(header->GetString(
-              kHeaderValueKey, &value));
-      }
-      if (!net::HttpUtil::IsSafeHeader(name)) {
-        error_ = download_extension_errors::kGenericError;
-        return false;
-      }
-    }
-  }
-  iodata_->rdh = content::ResourceDispatcherHost::Get();
-  iodata_->resource_context = profile()->GetResourceContext();
-  iodata_->render_process_host_id = render_view_host()->GetProcess()->GetID();
-  iodata_->render_view_host_routing_id = render_view_host()->GetRoutingID();
-  return true;
-}
-
-bool DownloadsDownloadFunction::RunInternal() {
-  VLOG(1) << __FUNCTION__ << " " << iodata_->url.spec();
-  if (!BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, base::Bind(
-          &DownloadsDownloadFunction::BeginDownloadOnIOThread, this))) {
-    error_ = download_extension_errors::kGenericError;
-    return false;
-  }
-  return true;
-}
-
-void DownloadsDownloadFunction::BeginDownloadOnIOThread() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DVLOG(1) << __FUNCTION__ << " " << iodata_->url.spec();
-  content::DownloadSaveInfo save_info;
-  // TODO(benjhayden) Ensure that this filename is interpreted as a path
-  // relative to the default downloads directory without allowing '..'.
-  save_info.suggested_name = iodata_->filename;
-  save_info.prompt_for_save_location = iodata_->save_as;
-
-  scoped_ptr<net::URLRequest> request(new net::URLRequest(iodata_->url, NULL));
-  request->set_method(iodata_->method);
-  if (iodata_->extra_headers != NULL) {
-    for (size_t index = 0; index < iodata_->extra_headers->GetSize(); ++index) {
-      base::DictionaryValue* header = NULL;
-      std::string name, value;
-      CHECK(iodata_->extra_headers->GetDictionary(index, &header));
-      CHECK(header->GetString(kHeaderNameKey, &name));
-      if (header->HasKey(kHeaderBinaryValueKey)) {
-        base::ListValue* binary_value = NULL;
-        CHECK(header->GetList(kHeaderBinaryValueKey, &binary_value));
-        for (size_t char_i = 0; char_i < binary_value->GetSize(); ++char_i) {
-          int char_value = 0;
-          CHECK(binary_value->GetInteger(char_i, &char_value));
-          if ((0 <= char_value) &&
-              (char_value <= 0xff)) {
-            value.push_back(char_value);
-          }
-        }
-      } else if (header->HasKey(kHeaderValueKey)) {
-        CHECK(header->GetString(kHeaderValueKey, &value));
-      }
-      request->SetExtraRequestHeaderByName(name, value, false/*overwrite*/);
-    }
-  }
-  if (!iodata_->post_body.empty()) {
-    request->AppendBytesToUpload(iodata_->post_body.data(),
-                                 iodata_->post_body.size());
-  }
-
-  // Prevent login prompts for 401/407 responses.
-  request->set_load_flags(request->load_flags() |
-                          net::LOAD_DO_NOT_PROMPT_FOR_LOGIN);
-
-  net::Error error = iodata_->rdh->BeginDownload(
-      request.Pass(),
-      false,  // is_content_initiated
-      iodata_->resource_context,
-      iodata_->render_process_host_id,
-      iodata_->render_view_host_routing_id,
-      false,  // prefer_cache
-      save_info,
-      base::Bind(&DownloadsDownloadFunction::OnStarted, this));
-  iodata_.reset();
-
-  if (error != net::OK) {
-    BrowserThread::PostTask(
-        BrowserThread::UI, FROM_HERE,
-        base::Bind(&DownloadsDownloadFunction::OnStarted, this,
-                   DownloadId::Invalid(), error));
-  }
-}
-
-void DownloadsDownloadFunction::OnStarted(DownloadId dl_id, net::Error error) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  VLOG(1) << __FUNCTION__ << " " << dl_id << " " << error;
-  if (dl_id.local() >= 0) {
-    result_.reset(base::Value::CreateIntegerValue(dl_id.local()));
-  } else {
-    error_ = net::ErrorToString(error);
-  }
-  SendResponse(error_.empty());
-}
-
-DownloadsSearchFunction::DownloadsSearchFunction()
-  : SyncDownloadsFunction(DOWNLOADS_FUNCTION_SEARCH),
-    query_(new DownloadQuery()),
-    get_id_(0),
-    has_get_id_(false) {
-}
-
-DownloadsSearchFunction::~DownloadsSearchFunction() {}
-
-bool DownloadsSearchFunction::ParseArgs() {
-  static base::LazyInstance<FilterTypeMap> filter_types =
-    LAZY_INSTANCE_INITIALIZER;
-  if (filter_types.Get().size() == 0)
-    InitFilterTypeMap(filter_types.Get());
-
-  base::DictionaryValue* query_json = NULL;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &query_json));
-  for (base::DictionaryValue::Iterator query_json_field(*query_json);
-       query_json_field.HasNext(); query_json_field.Advance()) {
-    FilterTypeMap::const_iterator filter_type =
-        filter_types.Get().find(query_json_field.key());
-
-    if (filter_type != filter_types.Get().end()) {
-      if (!query_->AddFilter(filter_type->second, query_json_field.value())) {
-        error_ = download_extension_errors::kInvalidFilterError;
-        return false;
-      }
-    } else if (query_json_field.key() == kIdKey) {
-      EXTENSION_FUNCTION_VALIDATE(query_json_field.value().GetAsInteger(
-          &get_id_));
-      has_get_id_ = true;
-    } else if (query_json_field.key() == kOrderByKey) {
-      if (!ParseOrderBy(query_json_field.value()))
-        return false;
-    } else if (query_json_field.key() == kDangerKey) {
-      std::string danger_str;
-      EXTENSION_FUNCTION_VALIDATE(query_json_field.value().GetAsString(
-          &danger_str));
-      content::DownloadDangerType danger_type =
-          DangerEnumFromString(danger_str);
-      if (danger_type == content::DOWNLOAD_DANGER_TYPE_MAX) {
-        error_ = download_extension_errors::kInvalidDangerTypeError;
-        return false;
-      }
-      query_->AddFilter(danger_type);
-    } else if (query_json_field.key() == kStateKey) {
-      std::string state_str;
-      EXTENSION_FUNCTION_VALIDATE(query_json_field.value().GetAsString(
-          &state_str));
-      DownloadItem::DownloadState state = StateEnumFromString(state_str);
-      if (state == DownloadItem::MAX_DOWNLOAD_STATE) {
-        error_ = download_extension_errors::kInvalidStateError;
-        return false;
-      }
-      query_->AddFilter(state);
-    } else if (query_json_field.key() == kLimitKey) {
-      int limit = 0;
-      EXTENSION_FUNCTION_VALIDATE(query_json_field.value().GetAsInteger(
-          &limit));
-      if (limit < 0) {
-        error_ = download_extension_errors::kInvalidQueryLimit;
-        return false;
-      }
-      query_->Limit(limit);
-    } else {
-      EXTENSION_FUNCTION_VALIDATE(false);
-    }
-  }
-  return true;
-}
-
-bool DownloadsSearchFunction::ParseOrderBy(const base::Value& order_by_value) {
-  static base::LazyInstance<SortTypeMap> sorter_types =
-    LAZY_INSTANCE_INITIALIZER;
-  if (sorter_types.Get().size() == 0)
-    InitSortTypeMap(sorter_types.Get());
-
-  std::string order_by_str;
-  EXTENSION_FUNCTION_VALIDATE(order_by_value.GetAsString(&order_by_str));
-  std::vector<std::string> order_by_strs;
-  base::SplitString(order_by_str, ' ', &order_by_strs);
-  for (std::vector<std::string>::const_iterator iter = order_by_strs.begin();
-      iter != order_by_strs.end(); ++iter) {
-    std::string term_str = *iter;
-    if (term_str.empty())
-      continue;
-    DownloadQuery::SortDirection direction = DownloadQuery::ASCENDING;
-    if (term_str[0] == '-') {
-      direction = DownloadQuery::DESCENDING;
-      term_str = term_str.substr(1);
-    }
-    SortTypeMap::const_iterator sorter_type =
-        sorter_types.Get().find(term_str);
-    if (sorter_type == sorter_types.Get().end()) {
-      error_ = download_extension_errors::kInvalidOrderByError;
-      return false;
-    }
-    query_->AddSorter(sorter_type->second, direction);
-  }
-  return true;
-}
-
-bool DownloadsSearchFunction::RunInternal() {
-  DownloadManager* manager = NULL;
-  DownloadManager* incognito_manager = NULL;
-  GetManagers(profile(), include_incognito(), &manager, &incognito_manager);
-  DownloadQuery::DownloadVector all_items, cpp_results;
-  if (has_get_id_) {
-    DownloadItem* item = manager->GetDownloadItem(get_id_);
-    if (!item && incognito_manager)
-      item = incognito_manager->GetDownloadItem(get_id_);
-    if (item)
-      all_items.push_back(item);
-  } else {
-    manager->GetAllDownloads(FilePath(FILE_PATH_LITERAL("")), &all_items);
-    if (incognito_manager)
-      incognito_manager->GetAllDownloads(
-          FilePath(FILE_PATH_LITERAL("")), &all_items);
-  }
-  query_->Search(all_items.begin(), all_items.end(), &cpp_results);
-  base::ListValue* json_results = new base::ListValue();
-  for (DownloadManager::DownloadVector::const_iterator it = cpp_results.begin();
-       it != cpp_results.end(); ++it) {
-    scoped_ptr<base::DictionaryValue> item(DownloadItemToJSON(*it));
-    json_results->Append(item.release());
-  }
-  result_.reset(json_results);
-  return true;
-}
-
-DownloadsPauseFunction::DownloadsPauseFunction()
-  : SyncDownloadsFunction(DOWNLOADS_FUNCTION_PAUSE),
-    download_id_(DownloadId::Invalid().local()) {
-}
-
-DownloadsPauseFunction::~DownloadsPauseFunction() {}
-
-bool DownloadsPauseFunction::ParseArgs() {
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &download_id_));
-  return true;
-}
-
-bool DownloadsPauseFunction::RunInternal() {
-  DownloadItem* download_item = GetActiveItem(download_id_);
-  if ((download_item == NULL) || !download_item->IsInProgress()) {
-    // This could be due to an invalid download ID, or it could be due to the
-    // download not being currently active.
-    error_ = download_extension_errors::kInvalidOperationError;
-  } else if (!download_item->IsPaused()) {
-    // If download_item->IsPaused() already then we treat it as a success.
-    download_item->TogglePause();
-  }
-  return error_.empty();
-}
-
-DownloadsResumeFunction::DownloadsResumeFunction()
-  : SyncDownloadsFunction(DOWNLOADS_FUNCTION_RESUME),
-    download_id_(DownloadId::Invalid().local()) {
-}
-
-DownloadsResumeFunction::~DownloadsResumeFunction() {}
-
-bool DownloadsResumeFunction::ParseArgs() {
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &download_id_));
-  return true;
-}
-
-bool DownloadsResumeFunction::RunInternal() {
-  DownloadItem* download_item = GetActiveItem(download_id_);
-  if (download_item == NULL) {
-    // This could be due to an invalid download ID, or it could be due to the
-    // download not being currently active.
-    error_ = download_extension_errors::kInvalidOperationError;
-  } else if (download_item->IsPaused()) {
-    // If !download_item->IsPaused() already, then we treat it as a success.
-    download_item->TogglePause();
-  }
-  return error_.empty();
-}
-
-DownloadsCancelFunction::DownloadsCancelFunction()
-  : SyncDownloadsFunction(DOWNLOADS_FUNCTION_CANCEL),
-    download_id_(DownloadId::Invalid().local()) {
-}
-
-DownloadsCancelFunction::~DownloadsCancelFunction() {}
-
-bool DownloadsCancelFunction::ParseArgs() {
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &download_id_));
-  return true;
-}
-
-bool DownloadsCancelFunction::RunInternal() {
-  DownloadItem* download_item = GetActiveItem(download_id_);
-  if (download_item != NULL)
-    download_item->Cancel(true);
-  // |download_item| can be NULL if the download ID was invalid or if the
-  // download is not currently active.  Either way, we don't consider it a
-  // failure.
-  return error_.empty();
-}
-
-DownloadsEraseFunction::DownloadsEraseFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_ERASE) {
-}
-
-DownloadsEraseFunction::~DownloadsEraseFunction() {}
-
-bool DownloadsEraseFunction::ParseArgs() {
-  base::DictionaryValue* query_json = NULL;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &query_json));
-  error_ = download_extension_errors::kNotImplementedError;
-  return false;
-}
-
-bool DownloadsEraseFunction::RunInternal() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-DownloadsSetDestinationFunction::DownloadsSetDestinationFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_SET_DESTINATION) {
-}
-
-DownloadsSetDestinationFunction::~DownloadsSetDestinationFunction() {}
-
-bool DownloadsSetDestinationFunction::ParseArgs() {
-  int dl_id = 0;
-  std::string path;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &dl_id));
-  EXTENSION_FUNCTION_VALIDATE(args_->GetString(1, &path));
-  VLOG(1) << __FUNCTION__ << " " << dl_id << " " << &path;
-  error_ = download_extension_errors::kNotImplementedError;
-  return false;
-}
-
-bool DownloadsSetDestinationFunction::RunInternal() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-DownloadsAcceptDangerFunction::DownloadsAcceptDangerFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_ACCEPT_DANGER) {
-}
-
-DownloadsAcceptDangerFunction::~DownloadsAcceptDangerFunction() {}
-
-bool DownloadsAcceptDangerFunction::ParseArgs() {
-  int dl_id = 0;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &dl_id));
-  VLOG(1) << __FUNCTION__ << " " << dl_id;
-  error_ = download_extension_errors::kNotImplementedError;
-  return false;
-}
-
-bool DownloadsAcceptDangerFunction::RunInternal() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-DownloadsShowFunction::DownloadsShowFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_SHOW) {
-}
-
-DownloadsShowFunction::~DownloadsShowFunction() {}
-
-bool DownloadsShowFunction::ParseArgs() {
-  int dl_id = 0;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &dl_id));
-  VLOG(1) << __FUNCTION__ << " " << dl_id;
-  error_ = download_extension_errors::kNotImplementedError;
-  return false;
-}
-
-bool DownloadsShowFunction::RunInternal() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-DownloadsDragFunction::DownloadsDragFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_DRAG) {
-}
-
-DownloadsDragFunction::~DownloadsDragFunction() {}
-
-bool DownloadsDragFunction::ParseArgs() {
-  int dl_id = 0;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &dl_id));
-  VLOG(1) << __FUNCTION__ << " " << dl_id;
-  error_ = download_extension_errors::kNotImplementedError;
-  return false;
-}
-
-bool DownloadsDragFunction::RunInternal() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-DownloadsGetFileIconFunction::DownloadsGetFileIconFunction()
-  : AsyncDownloadsFunction(DOWNLOADS_FUNCTION_GET_FILE_ICON),
-    icon_size_(kDefaultIconSize),
-    icon_extractor_(new DownloadFileIconExtractorImpl()) {
-}
-
-DownloadsGetFileIconFunction::~DownloadsGetFileIconFunction() {}
-
-void DownloadsGetFileIconFunction::SetIconExtractorForTesting(
-    DownloadFileIconExtractor* extractor) {
-  DCHECK(extractor);
-  icon_extractor_.reset(extractor);
-}
-
-bool DownloadsGetFileIconFunction::ParseArgs() {
-  int dl_id = 0;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &dl_id));
-
-  base::DictionaryValue* options = NULL;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(1, &options));
-  if (options->HasKey(kSizeKey)) {
-    EXTENSION_FUNCTION_VALIDATE(options->GetInteger(kSizeKey, &icon_size_));
-    // We only support 16px and 32px icons. This is enforced in
-    // experimental.downloads.json.
-    DCHECK(icon_size_ == 16 || icon_size_ == 32);
-  }
-
-  DownloadManager* manager = NULL;
-  DownloadManager* incognito_manager = NULL;
-  GetManagers(profile(), include_incognito(), &manager, &incognito_manager);
-  DownloadItem* download_item = manager->GetDownloadItem(dl_id);
-  if (!download_item && incognito_manager)
-    download_item = incognito_manager->GetDownloadItem(dl_id);
-  if (!download_item) {
-    // The DownloadItem is is added to history when the path is determined. If
-    // the download is not in history, then we don't have a path / final
-    // filename and no icon.
-    error_ = download_extension_errors::kInvalidOperationError;
-    return false;
-  }
-  // In-progress downloads return the intermediate filename for GetFullPath()
-  // which doesn't have the final extension. Therefore we won't be able to
-  // derive a good file icon for it. So we use GetTargetFilePath() instead.
-  path_ = download_item->GetTargetFilePath();
-  DCHECK(!path_.empty());
-  return true;
-}
-
-bool DownloadsGetFileIconFunction::RunInternal() {
-  DCHECK(!path_.empty());
-  DCHECK(icon_extractor_.get());
-  EXTENSION_FUNCTION_VALIDATE(icon_extractor_->ExtractIconURLForPath(
-      path_, IconLoaderSizeFromPixelSize(icon_size_),
-      base::Bind(&DownloadsGetFileIconFunction::OnIconURLExtracted, this)));
-  return true;
-}
-
-void DownloadsGetFileIconFunction::OnIconURLExtracted(const std::string& url) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  if (url.empty())
-    error_ = download_extension_errors::kIconNotFoundError;
-  else
-    result_.reset(base::Value::CreateStringValue(url));
-  SendResponse(error_.empty());
-}
-
-ExtensionDownloadsEventRouter::ExtensionDownloadsEventRouter(Profile* profile)
-  : profile_(profile),
-    manager_(NULL),
-    delete_item_jsons_(&item_jsons_),
-    delete_on_changed_stats_(&on_changed_stats_) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK(profile_);
-  // Register a callback with the DownloadService for this profile to be called
-  // when it creates the DownloadManager, or now if the manager already exists.
-  DownloadServiceFactory::GetForProfile(profile)->OnManagerCreated(base::Bind(
-      &ExtensionDownloadsEventRouter::Init, base::Unretained(this)));
-}
-
-// The only public methods on this class are ModelChanged() and
-// ManagerGoingDown(), and they are only called by DownloadManager, so
-// there's no way for any methods on this class to be called before
-// DownloadService calls Init() via the OnManagerCreated Callback above.
-void ExtensionDownloadsEventRouter::Init(DownloadManager* manager) {
-  DCHECK(manager_ == NULL);
-  manager_ = manager;
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  manager_->AddObserver(this);
-}
-
-ExtensionDownloadsEventRouter::~ExtensionDownloadsEventRouter() {
-  if (manager_ != NULL)
-    manager_->RemoveObserver(this);
-  for (ItemMap::const_iterator iter = downloads_.begin();
-       iter != downloads_.end(); ++iter) {
-    if (iter->second != NULL)
-      iter->second->RemoveObserver(this);
-  }
-}
-
-ExtensionDownloadsEventRouter::OnChangedStat::OnChangedStat()
-  : fires(0),
-    total(0) {
-}
-
-ExtensionDownloadsEventRouter::OnChangedStat::~OnChangedStat() {
-  if (total > 0)
-    UMA_HISTOGRAM_PERCENTAGE("Download.OnChanged", (fires * 100 / total));
-}
-
-void ExtensionDownloadsEventRouter::OnDownloadUpdated(DownloadItem* item) {
-  int download_id = item->GetId();
-  if (item->GetState() == DownloadItem::REMOVING) {
-    // The REMOVING state indicates that this item is being erased.
-    // Let's unregister as an observer so that we don't see any more updates
-    // from it, dispatch the onErased event, and remove its json and is
-    // OnChangedStat from our maps.
-    downloads_.erase(download_id);
-    item->RemoveObserver(this);
-    DispatchEvent(extension_event_names::kOnDownloadErased,
-                  base::Value::CreateIntegerValue(download_id));
-    delete item_jsons_[download_id];
-    item_jsons_.erase(download_id);
-    delete on_changed_stats_[download_id];
-    on_changed_stats_.erase(download_id);
-    return;
-  }
-
-  base::DictionaryValue* old_json = item_jsons_[download_id];
-  scoped_ptr<base::DictionaryValue> new_json(DownloadItemToJSON(item));
-  scoped_ptr<base::DictionaryValue> delta(new base::DictionaryValue());
-  delta->SetInteger(kIdKey, download_id);
-  std::set<std::string> new_fields;
-  bool changed = false;
-
-  // For each field in the new json representation of the item except the
-  // bytesReceived field, if the field has changed from the previous old json,
-  // set the differences in the |delta| object and remember that something
-  // significant changed.
-  for (base::DictionaryValue::Iterator iter(*new_json.get());
-       iter.HasNext(); iter.Advance()) {
-    new_fields.insert(iter.key());
-    if (iter.key() != kBytesReceivedKey) {
-      base::Value* old_value = NULL;
-      if (!old_json->HasKey(iter.key()) ||
-          (old_json->Get(iter.key(), &old_value) &&
-           !iter.value().Equals(old_value))) {
-        delta->Set(iter.key() + ".new", iter.value().DeepCopy());
-        if (old_value)
-          delta->Set(iter.key() + ".old", old_value->DeepCopy());
-        changed = true;
-      }
-    }
-  }
-
-  // If a field was in the previous json but is not in the new json, set the
-  // difference in |delta|.
-  for (base::DictionaryValue::Iterator iter(*old_json);
-       iter.HasNext(); iter.Advance()) {
-    if (new_fields.find(iter.key()) == new_fields.end()) {
-      delta->Set(iter.key() + ".old", iter.value().DeepCopy());
-      changed = true;
-    }
-  }
-
-  // Update the OnChangedStat and dispatch the event if something significant
-  // changed. Replace the stored json with the new json.
-  ++(on_changed_stats_[download_id]->total);
-  if (changed) {
-    DispatchEvent(extension_event_names::kOnDownloadChanged, delta.release());
-    ++(on_changed_stats_[download_id]->fires);
-  }
-  item_jsons_[download_id]->Swap(new_json.get());
-}
-
-void ExtensionDownloadsEventRouter::OnDownloadOpened(DownloadItem* item) {
-}
-
-void ExtensionDownloadsEventRouter::ModelChanged(DownloadManager* manager) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK(manager_ == manager);
-  typedef std::set<int> DownloadIdSet;
-
-  // Get all the download items.
-  DownloadManager::DownloadVector current_vec;
-  manager_->SearchDownloads(string16(), &current_vec);
-
-  // Populate set<>s of download item identifiers so that we can find
-  // differences between the old and the new set of download items.
-  DownloadIdSet current_set, prev_set;
-  for (ItemMap::const_iterator iter = downloads_.begin();
-       iter != downloads_.end(); ++iter) {
-    prev_set.insert(iter->first);
-  }
-  ItemMap current_map;
-  for (DownloadManager::DownloadVector::const_iterator iter =
-       current_vec.begin();
-       iter != current_vec.end(); ++iter) {
-    DownloadItem* item = *iter;
-    int item_id = item->GetId();
-    CHECK(item_id >= 0);
-    DCHECK(current_map.find(item_id) == current_map.end());
-    current_set.insert(item_id);
-    current_map[item_id] = item;
-  }
-  DownloadIdSet new_set;  // current_set - prev_set;
-  std::set_difference(current_set.begin(), current_set.end(),
-                      prev_set.begin(), prev_set.end(),
-                      std::insert_iterator<DownloadIdSet>(
-                        new_set, new_set.begin()));
-
-  // For each download that was not in the old set of downloads but is in the
-  // new set of downloads, fire an onCreated event, register as an Observer of
-  // the item, store a json representation of the item so that we can easily
-  // find changes in that json representation, and make an OnChangedStat.
-  for (DownloadIdSet::const_iterator iter = new_set.begin();
-       iter != new_set.end(); ++iter) {
-    scoped_ptr<base::DictionaryValue> item(
-        DownloadItemToJSON(current_map[*iter]));
-    DispatchEvent(extension_event_names::kOnDownloadCreated, item->DeepCopy());
-    DCHECK(item_jsons_.find(*iter) == item_jsons_.end());
-    on_changed_stats_[*iter] = new OnChangedStat();
-    current_map[*iter]->AddObserver(this);
-    item_jsons_[*iter] = item.release();
-  }
-  downloads_.swap(current_map);
-
-  // Dispatching onErased is handled in OnDownloadUpdated when an item
-  // transitions to the REMOVING state.
-}
-
-void ExtensionDownloadsEventRouter::ManagerGoingDown(
-    DownloadManager* manager) {
-  manager_->RemoveObserver(this);
-  manager_ = NULL;
-}
-
-void ExtensionDownloadsEventRouter::DispatchEvent(
-    const char* event_name, base::Value* arg) {
-  ListValue args;
-  args.Append(arg);
-  std::string json_args;
-  base::JSONWriter::Write(&args, &json_args);
-  profile_->GetExtensionEventRouter()->DispatchEventToRenderers(
-      event_name,
-      json_args,
-      profile_,
-      GURL());
-}