Mac: Add a shortcut to open the Apps page from the bookmark bar.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_bridge.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.
 
 // C++ bridge class between Chromium and Cocoa to connect the
 // Bookmarks (model) with the Bookmark Bar (view).
 //
 // There is exactly one BookmarkBarBridge per BookmarkBarController /
 // BrowserWindowController / Browser.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_BRIDGE_H_
 #define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_BRIDGE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/prefs/public/pref_change_registrar.h"
 #include "chrome/browser/bookmarks/bookmark_model_observer.h"
 
-class Browser;
+class Profile;
 @class BookmarkBarController;
 
 class BookmarkBarBridge : public BookmarkModelObserver {
  public:
-  BookmarkBarBridge(BookmarkBarController* controller,
+  BookmarkBarBridge(Profile* profile,
+                    BookmarkBarController* controller,
                     BookmarkModel* model);
   virtual ~BookmarkBarBridge();
 
   // Overridden from BookmarkModelObserver
   virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE;
   virtual void BookmarkModelBeingDeleted(BookmarkModel* model) OVERRIDE;
   virtual void BookmarkNodeMoved(BookmarkModel* model,
                                  const BookmarkNode* old_parent,
                                  int old_index,
                                  const BookmarkNode* new_parent,
@@ skipping 12 matching lines @@
   virtual void BookmarkNodeChildrenReordered(BookmarkModel* model,
                                              const BookmarkNode* node) OVERRIDE;
   virtual void ExtensiveBookmarkChangesBeginning(BookmarkModel* model) OVERRIDE;
   virtual void ExtensiveBookmarkChangesEnded(BookmarkModel* model) OVERRIDE;
 
  private:
   BookmarkBarController* controller_;  // weak; owns me
   BookmarkModel* model_;  // weak; it is owned by a Profile.
   bool batch_mode_;
 
+  // Needed to react to kShowAppsShortcutInBookmarkBar changes.
+  PrefChangeRegistrar profile_pref_registrar_;
+
+  // Updates the visibility of the apps shortcut based on the pref value.
+  void OnAppsPageShortcutVisibilityChanged();
+
   DISALLOW_COPY_AND_ASSIGN(BookmarkBarBridge);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_BRIDGE_H_