Added notification when user presses backspace to use new shortcut.

chrome/browser/ui/views/frame/browser_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_VIEW_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 35 matching lines @@
 // view: http://dev.chromium.org/developers/design-documents/browser-window
 
 class BookmarkBarView;
 class Browser;
 class BrowserViewLayout;
 class ContentsLayoutManager;
 class DownloadShelfView;
 class ExclusiveAccessBubbleViews;
 class InfoBarContainerView;
 class LocationBarView;
+class NewBackShortcutBubble;
 class StatusBubbleViews;
 class TabStrip;
 class ToolbarView;
 class TopContainerView;
 class WebContentsCloseHandler;
 
 #if defined(OS_WIN)
 class JumpList;
 #endif
 
@@ skipping 216 matching lines @@
                        ExclusiveAccessBubbleType bubble_type,
                        bool with_toolbar) override;
   void ExitFullscreen() override;
   void UpdateExclusiveAccessExitBubbleContent(
       const GURL& url,
       ExclusiveAccessBubbleType bubble_type) override;
   void OnExclusiveAccessUserInput() override;
   bool ShouldHideUIForFullscreen() const override;
   bool IsFullscreen() const override;
   bool IsFullscreenBubbleVisible() const override;
+  void ShowNewBackShortcutBubble(bool forward) override;
   LocationBar* GetLocationBar() const override;
   void SetFocusToLocationBar(bool select_all) override;
   void UpdateReloadStopState(bool is_loading, bool force) override;
   void UpdateToolbar(content::WebContents* contents) override;
   void ResetToolbarTabState(content::WebContents* contents) override;
   void FocusToolbar() override;
   ToolbarActionsBar* GetToolbarActionsBar() override;
   void ToolbarSizeChanged(bool is_animating) override;
   void FocusAppMenu() override;
   void FocusBookmarksToolbar() override;
@@ skipping 359 matching lines @@
   // OnThemeChanged()).
   bool handling_theme_changed_;
 
   // True when in ProcessFullscreen(). The flag is used to avoid reentrance and
   // to ignore requests to layout while in ProcessFullscreen() to reduce
   // jankiness.
   bool in_process_fullscreen_;
 
   std::unique_ptr<ExclusiveAccessBubbleViews> exclusive_access_bubble_;
 
+  std::unique_ptr<NewBackShortcutBubble> new_back_shortcut_bubble_;
+
 #if defined(OS_WIN)
   // Helper class to listen for completion of first page load.
   std::unique_ptr<LoadCompleteListener> load_complete_listener_;
 
   // The custom JumpList for Windows 7.
   scoped_refptr<JumpList> jumplist_;
 #endif
 
   // The timer used to update frames for the Loading Animation.
   base::RepeatingTimer loading_animation_timer_;
@@ skipping 13 matching lines @@
   // The class that registers for keyboard shortcuts for extension commands.
   std::unique_ptr<ExtensionKeybindingRegistryViews>
       extension_keybinding_registry_;
 
   mutable base::WeakPtrFactory<BrowserView> activate_modal_dialog_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_VIEW_H_