Relanding this as the initial attempt was reverted because of linux chrome os compile failures.

chrome/browser/ui/views/hung_renderer_view.h

Index: chrome/browser/ui/views/hung_renderer_view.h
===================================================================
--- chrome/browser/ui/views/hung_renderer_view.h	(revision 147879)
+++ chrome/browser/ui/views/hung_renderer_view.h	(working copy)
@@ -1,66 +1,23 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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/ui/browser_dialogs.h"
+#ifndef CHROME_BROWSER_UI_VIEWS_HUNG_RENDERER_VIEW_H_
+#define CHROME_BROWSER_UI_VIEWS_HUNG_RENDERER_VIEW_H_
 
-#if defined(OS_WIN) && !defined(USE_AURA)
-#include <windows.h>
-#endif
-
-#include "base/i18n/rtl.h"
 #include "base/memory/scoped_vector.h"
-#include "base/process_util.h"
-#include "base/utf_string_conversions.h"
-#include "chrome/browser/favicon/favicon_tab_helper.h"
-#include "chrome/browser/platform_util.h"
-#include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
-#include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
-#include "chrome/common/chrome_constants.h"
-#include "chrome/common/logging_chrome.h"
-#include "content/public/browser/render_process_host.h"
-#include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/common/result_codes.h"
-#include "grit/chromium_strings.h"
-#include "grit/generated_resources.h"
-#include "grit/theme_resources.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/canvas.h"
+#include "content/public/browser/web_contents_observer.h"
 #include "ui/views/controls/button/text_button.h"
-#include "ui/views/controls/image_view.h"
-#include "ui/views/controls/label.h"
 #include "ui/views/controls/table/group_table_model.h"
 #include "ui/views/controls/table/group_table_view.h"
-#include "ui/views/layout/grid_layout.h"
-#include "ui/views/layout/layout_constants.h"
-#include "ui/views/widget/widget.h"
-#include "ui/views/window/client_view.h"
 #include "ui/views/window/dialog_delegate.h"
 
-#if defined(USE_AURA)
-#include "ui/aura/window.h"
-#endif
-
-#if defined(OS_WIN)
-#include "chrome/browser/hang_monitor/hang_crash_dump_win.h"
-#endif
-
-class HungRendererDialogView;
-
 using content::RenderViewHost;
 using content::WebContents;
 
-namespace {
-// We only support showing one of these at a time per app.
-HungRendererDialogView* g_instance = NULL;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungPagesTableModel
-
+// Provides functionality to display information about a hung renderer.
 class HungPagesTableModel : public views::GroupTableModel {
  public:
   // The Delegate is notified any time a WebContents the model is listening to
@@ -86,11 +43,12 @@
   RenderViewHost* GetRenderViewHost();
 
   // Overridden from views::GroupTableModel:
-  virtual int RowCount();
-  virtual string16 GetText(int row, int column_id);
-  virtual gfx::ImageSkia GetIcon(int row);
-  virtual void SetObserver(ui::TableModelObserver* observer);
-  virtual void GetGroupRangeForItem(int item, views::GroupRange* range);
+  virtual int RowCount() OVERRIDE;
+  virtual string16 GetText(int row, int column_id) OVERRIDE;
+  virtual gfx::ImageSkia GetIcon(int row) OVERRIDE;
+  virtual void SetObserver(ui::TableModelObserver* observer) OVERRIDE;
+  virtual void GetGroupRangeForItem(int item, views::GroupRange* range)
+      OVERRIDE;
 
  private:
   // Used to track a single WebContents. If the WebContents is destroyed
@@ -132,129 +90,20 @@
   DISALLOW_COPY_AND_ASSIGN(HungPagesTableModel);
 };
 
-///////////////////////////////////////////////////////////////////////////////
-// HungPagesTableModel, public:
-
-HungPagesTableModel::HungPagesTableModel(Delegate* delegate)
-    : observer_(NULL),
-      delegate_(delegate) {
-}
-
-HungPagesTableModel::~HungPagesTableModel() {
-}
-
-content::RenderProcessHost* HungPagesTableModel::GetRenderProcessHost() {
-  return tab_observers_.empty() ? NULL :
-      tab_observers_[0]->web_contents()->GetRenderProcessHost();
-}
-
-RenderViewHost* HungPagesTableModel::GetRenderViewHost() {
-  return tab_observers_.empty() ? NULL :
-      tab_observers_[0]->web_contents()->GetRenderViewHost();
-}
-
-void HungPagesTableModel::InitForWebContents(WebContents* hung_contents) {
-  tab_observers_.clear();
-  if (hung_contents) {
-    // Force hung_contents to be first.
-    TabContents* hung_tab_contents =
-        TabContents::FromWebContents(hung_contents);
-    if (hung_tab_contents) {
-      tab_observers_.push_back(new WebContentsObserverImpl(this,
-                                                           hung_tab_contents));
-    }
-    for (TabContentsIterator it; !it.done(); ++it) {
-      if (*it != hung_tab_contents &&
-          it->web_contents()->GetRenderProcessHost() ==
-          hung_contents->GetRenderProcessHost())
-        tab_observers_.push_back(new WebContentsObserverImpl(this, *it));
-    }
-  }
-  // The world is different.
-  if (observer_)
-    observer_->OnModelChanged();
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungPagesTableModel, views::GroupTableModel implementation:
-
-int HungPagesTableModel::RowCount() {
-  return static_cast<int>(tab_observers_.size());
-}
-
-string16 HungPagesTableModel::GetText(int row, int column_id) {
-  DCHECK(row >= 0 && row < RowCount());
-  string16 title = tab_observers_[row]->web_contents()->GetTitle();
-  if (title.empty())
-    title = CoreTabHelper::GetDefaultTitle();
-  // TODO(xji): Consider adding a special case if the title text is a URL,
-  // since those should always have LTR directionality. Please refer to
-  // http://crbug.com/6726 for more information.
-  base::i18n::AdjustStringForLocaleDirection(&title);
-  return title;
-}
-
-gfx::ImageSkia HungPagesTableModel::GetIcon(int row) {
-  DCHECK(row >= 0 && row < RowCount());
-  return tab_observers_[row]->favicon_tab_helper()->GetFavicon();
-}
-
-void HungPagesTableModel::SetObserver(ui::TableModelObserver* observer) {
-  observer_ = observer;
-}
-
-void HungPagesTableModel::GetGroupRangeForItem(int item,
-                                               views::GroupRange* range) {
-  DCHECK(range);
-  range->start = 0;
-  range->length = RowCount();
-}
-
-void HungPagesTableModel::TabDestroyed(WebContentsObserverImpl* tab) {
-  // Clean up tab_observers_ and notify our observer.
-  TabObservers::iterator i = std::find(
-      tab_observers_.begin(), tab_observers_.end(), tab);
-  DCHECK(i != tab_observers_.end());
-  int index = static_cast<int>(i - tab_observers_.begin());
-  tab_observers_.erase(i);
-  if (observer_)
-    observer_->OnItemsRemoved(index, 1);
-
-  // Notify the delegate.
-  delegate_->TabDestroyed();
-  // WARNING: we've likely been deleted.
-}
-
-HungPagesTableModel::WebContentsObserverImpl::WebContentsObserverImpl(
-    HungPagesTableModel* model,
-    TabContents* tab)
-    : content::WebContentsObserver(tab->web_contents()),
-      model_(model),
-      tab_(tab) {
-}
-
-void HungPagesTableModel::WebContentsObserverImpl::RenderViewGone(
-    base::TerminationStatus status) {
-  model_->TabDestroyed(this);
-}
-
-void HungPagesTableModel::WebContentsObserverImpl::WebContentsDestroyed(
-    WebContents* tab) {
-  model_->TabDestroyed(this);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView
-
+// This class displays a dialog which contains information about a hung
+// renderer process.
 class HungRendererDialogView : public views::DialogDelegateView,
                                public views::ButtonListener,
                                public HungPagesTableModel::Delegate {
  public:
-  HungRendererDialogView();
-  ~HungRendererDialogView();
+  // Factory function for creating an instance of the HungRendererDialogView
+  // class. At any given point only one instance can be active.
+  static HungRendererDialogView* Create();
+  // Returns a pointer to the singleton instance if any.
+  static HungRendererDialogView* GetInstance();
 
-  void ShowForWebContents(WebContents* contents);
-  void EndForWebContents(WebContents* contents);
+  virtual void ShowForWebContents(WebContents* contents);
+  virtual void EndForWebContents(WebContents* contents);
 
   // views::DialogDelegateView overrides:
   virtual string16 GetWindowTitle() const OVERRIDE;
@@ -273,11 +122,19 @@
   virtual void TabDestroyed() OVERRIDE;
 
  protected:
+  HungRendererDialogView();
+  virtual ~HungRendererDialogView();
+
   // views::View overrides:
   virtual void ViewHierarchyChanged(bool is_add,
                                     views::View* parent,
                                     views::View* child) OVERRIDE;
 
+  // Returns true if the frame is in the foreground.
+  bool IsFrameActive(WebContents* contents);
+
+  static HungRendererDialogView* g_instance_;
+
  private:
   // Initialize the controls in this dialog.
   void Init();
@@ -311,288 +168,4 @@
   DISALLOW_COPY_AND_ASSIGN(HungRendererDialogView);
 };
 
-// static
-gfx::ImageSkia* HungRendererDialogView::frozen_icon_ = NULL;
-
-// The distance in pixels from the top of the relevant contents to place the
-// warning window.
-static const int kOverlayContentsOffsetY = 50;
-
-// The dimensions of the hung pages list table view, in pixels.
-static const int kTableViewWidth = 300;
-static const int kTableViewHeight = 100;
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView, public:
-
-HungRendererDialogView::HungRendererDialogView()
-    : hung_pages_table_(NULL),
-      kill_button_(NULL),
-      kill_button_container_(NULL),
-      initialized_(false) {
-  InitClass();
-}
-
-HungRendererDialogView::~HungRendererDialogView() {
-  hung_pages_table_->SetModel(NULL);
-}
-
-void HungRendererDialogView::ShowForWebContents(WebContents* contents) {
-  DCHECK(contents && GetWidget());
-
-  // Don't show the warning unless the foreground window is the frame, or this
-  // window (but still invisible). If the user has another window or
-  // application selected, activating ourselves is rude.
-  gfx::NativeView frame_view =
-      platform_util::GetTopLevel(contents->GetNativeView());
-  if (!platform_util::IsWindowActive(frame_view) &&
-      !platform_util::IsWindowActive(GetWidget()->GetNativeWindow())) {
-    return;
-  }
-
-  if (!GetWidget()->IsActive()) {
-    gfx::Rect bounds = GetDisplayBounds(contents);
-    views::Widget* insert_after =
-        views::Widget::GetWidgetForNativeView(frame_view);
-    GetWidget()->SetBoundsConstrained(bounds);
-    if (insert_after)
-      GetWidget()->StackAboveWidget(insert_after);
-
-    // We only do this if the window isn't active (i.e. hasn't been shown yet,
-    // or is currently shown but deactivated for another WebContents). This is
-    // because this window is a singleton, and it's possible another active
-    // renderer may hang while this one is showing, and we don't want to reset
-    // the list of hung pages for a potentially unrelated renderer while this
-    // one is showing.
-    hung_pages_table_model_->InitForWebContents(contents);
-    GetWidget()->Show();
-  }
-}
-
-void HungRendererDialogView::EndForWebContents(WebContents* contents) {
-  DCHECK(contents);
-  if (hung_pages_table_model_->RowCount() == 0 ||
-      hung_pages_table_model_->GetRenderProcessHost() ==
-      contents->GetRenderProcessHost()) {
-    GetWidget()->Close();
-    // Close is async, make sure we drop our references to the tab immediately
-    // (it may be going away).
-    hung_pages_table_model_->InitForWebContents(NULL);
-  }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView, views::DialogDelegate implementation:
-
-string16 HungRendererDialogView::GetWindowTitle() const {
-  return l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER_TITLE);
-}
-
-void HungRendererDialogView::WindowClosing() {
-  // We are going to be deleted soon, so make sure our instance is destroyed.
-  g_instance = NULL;
-}
-
-int HungRendererDialogView::GetDialogButtons() const {
-  // We specifically don't want a CANCEL button here because that code path is
-  // also called when the window is closed by the user clicking the X button in
-  // the window's titlebar, and also if we call Window::Close. Rather, we want
-  // the OK button to wait for responsiveness (and close the dialog) and our
-  // additional button (which we create) to kill the process (which will result
-  // in the dialog being destroyed).
-  return ui::DIALOG_BUTTON_OK;
-}
-
-string16 HungRendererDialogView::GetDialogButtonLabel(
-    ui::DialogButton button) const {
-  if (button == ui::DIALOG_BUTTON_OK)
-    return l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER_WAIT);
-  return string16();
-}
-
-views::View* HungRendererDialogView::GetExtraView() {
-  return kill_button_container_;
-}
-
-bool HungRendererDialogView::Accept(bool window_closing) {
-  // Don't do anything if we're being called only because the dialog is being
-  // destroyed and we don't supply a Cancel function...
-  if (window_closing)
-    return true;
-
-  // Start waiting again for responsiveness.
-  if (hung_pages_table_model_->GetRenderViewHost())
-    hung_pages_table_model_->GetRenderViewHost()->RestartHangMonitorTimeout();
-  return true;
-}
-
-views::View* HungRendererDialogView::GetContentsView() {
-  return this;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView, views::ButtonListener implementation:
-
-void HungRendererDialogView::ButtonPressed(
-    views::Button* sender, const views::Event& event) {
-  if (sender == kill_button_ &&
-      hung_pages_table_model_->GetRenderProcessHost()) {
-
-    base::ProcessHandle process_handle =
-        hung_pages_table_model_->GetRenderProcessHost()->GetHandle();
-
-#if defined(OS_WIN)
-    // Try to generate a crash report for the hung process.
-    CrashDumpAndTerminateHungChildProcess(process_handle);
-#else
-    // Kill the process.
-    base::KillProcess(process_handle, content::RESULT_CODE_HUNG, false);
-#endif
-  }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView, HungPagesTableModel::Delegate overrides:
-
-void HungRendererDialogView::TabDestroyed() {
-  GetWidget()->Close();
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView, views::View overrides:
-
-void HungRendererDialogView::ViewHierarchyChanged(bool is_add,
-                                                  views::View* parent,
-                                                  views::View* child) {
-  if (!initialized_ && is_add && child == this && GetWidget())
-    Init();
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// HungRendererDialogView, private:
-
-void HungRendererDialogView::Init() {
-  views::ImageView* frozen_icon_view = new views::ImageView;
-  frozen_icon_view->SetImage(frozen_icon_);
-
-  views::Label* info_label = new views::Label(
-      l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER));
-  info_label->SetMultiLine(true);
-  info_label->SetHorizontalAlignment(views::Label::ALIGN_LEFT);
-
-  hung_pages_table_model_.reset(new HungPagesTableModel(this));
-  std::vector<ui::TableColumn> columns;
-  columns.push_back(ui::TableColumn());
-  hung_pages_table_ = new views::GroupTableView(
-      hung_pages_table_model_.get(), columns, views::ICON_AND_TEXT, true,
-      false, true, false);
-
-  CreateKillButtonView();
-
-  using views::GridLayout;
-  using views::ColumnSet;
-
-  GridLayout* layout = GridLayout::CreatePanel(this);
-  SetLayoutManager(layout);
-
-  const int double_column_set_id = 0;
-  ColumnSet* column_set = layout->AddColumnSet(double_column_set_id);
-  column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING, 0,
-                        GridLayout::FIXED, frozen_icon_->width(), 0);
-  column_set->AddPaddingColumn(
-      0, views::kUnrelatedControlLargeHorizontalSpacing);
-  column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
-                        GridLayout::USE_PREF, 0, 0);
-
-  layout->StartRow(0, double_column_set_id);
-  layout->AddView(frozen_icon_view, 1, 3);
-  // Add the label with a preferred width of 1, this way it doesn't effect the
-  // overall preferred size of the dialog.
-  layout->AddView(
-      info_label, 1, 1, GridLayout::FILL, GridLayout::LEADING, 1, 0);
-
-  layout->AddPaddingRow(0, views::kRelatedControlVerticalSpacing);
-
-  layout->StartRow(0, double_column_set_id);
-  layout->SkipColumns(1);
-  layout->AddView(hung_pages_table_->CreateParentIfNecessary(), 1, 1,
-                  views::GridLayout::FILL,
-                  views::GridLayout::FILL, kTableViewWidth, kTableViewHeight);
-
-  initialized_ = true;
-}
-
-void HungRendererDialogView::CreateKillButtonView() {
-  kill_button_ = new views::NativeTextButton(this,
-      l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER_END));
-
-  kill_button_container_ = new View;
-
-  using views::GridLayout;
-  using views::ColumnSet;
-
-  GridLayout* layout = new GridLayout(kill_button_container_);
-  kill_button_container_->SetLayoutManager(layout);
-
-  const int single_column_set_id = 0;
-  ColumnSet* column_set = layout->AddColumnSet(single_column_set_id);
-  column_set->AddPaddingColumn(0, frozen_icon_->width() +
-      views::kPanelHorizMargin + views::kUnrelatedControlHorizontalSpacing);
-  column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING, 0,
-                        GridLayout::USE_PREF, 0, 0);
-
-  layout->StartRow(0, single_column_set_id);
-  layout->AddView(kill_button_);
-}
-
-gfx::Rect HungRendererDialogView::GetDisplayBounds(
-    WebContents* contents) {
-#if defined(USE_AURA)
-  gfx::Rect contents_bounds(contents->GetNativeView()->GetBoundsInRootWindow());
-#elif defined(OS_WIN)
-  HWND contents_hwnd = contents->GetNativeView();
-  RECT contents_bounds_rect;
-  GetWindowRect(contents_hwnd, &contents_bounds_rect);
-  gfx::Rect contents_bounds(contents_bounds_rect);
-#endif
-  gfx::Rect window_bounds = GetWidget()->GetWindowBoundsInScreen();
-
-  int window_x = contents_bounds.x() +
-      (contents_bounds.width() - window_bounds.width()) / 2;
-  int window_y = contents_bounds.y() + kOverlayContentsOffsetY;
-  return gfx::Rect(window_x, window_y, window_bounds.width(),
-                   window_bounds.height());
-}
-
-// static
-void HungRendererDialogView::InitClass() {
-  static bool initialized = false;
-  if (!initialized) {
-    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-    frozen_icon_ = rb.GetImageSkiaNamed(IDR_FROZEN_TAB_ICON);
-    initialized = true;
-  }
-}
-
-static HungRendererDialogView* CreateHungRendererDialogView() {
-  HungRendererDialogView* cv = new HungRendererDialogView;
-  views::Widget::CreateWindow(cv);
-  return cv;
-}
-
-namespace chrome {
-
-void ShowHungRendererDialog(WebContents* contents) {
-  if (!logging::DialogsAreSuppressed()) {
-    if (!g_instance)
-      g_instance = CreateHungRendererDialogView();
-    g_instance->ShowForWebContents(contents);
-  }
-}
-
-void HideHungRendererDialog(WebContents* contents) {
-  if (!logging::DialogsAreSuppressed() && g_instance)
-    g_instance->EndForWebContents(contents);
-}
-
-}  // namespace chrome
+#endif  // CHROME_BROWSER_UI_VIEWS_HUNG_RENDERER_VIEW_H_