Changes BookmarkBarView to only create buttons as needed

chrome/browser/ui/views/bookmarks/bookmark_bar_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_BOOKMARKS_BOOKMARK_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 268 matching lines @@
   // calculating the preferred height.
   void Init();
 
   // NOTE: unless otherwise stated all methods that take an int for an index are
   // in terms of the bookmark bar view. Typically the view index and model index
   // are the same, but they may differ during animations or drag and drop.
   //
   // It's easy to get the mapping wrong. For this reason all these methods are
   // private.
 
-  // Returns the number of buttons corresponding to starred urls/folders. This
-  // is equivalent to the number of children the bookmark bar node from the
-  // bookmark bar model has.
+  // Returns the number of bookmark bar url/folder buttons that have been
+  // created. This does not necessarily represent the number of bookmark bar
+  // nodes, nor the number of visible bookmark bar buttons. Buttons are created
+  // lazily to fill available space, and may be hidden for ordering or sizing
+  // changes.
   int GetBookmarkButtonCount() const;
 
   // Returns the button at the specified index.
   views::LabelButton* GetBookmarkButton(int index);
 
   // Returns BOOKMARK_LAUNCH_LOCATION_DETACHED_BAR or
   // BOOKMARK_LAUNCH_LOCATION_ATTACHED_BAR based on detached state.
   BookmarkLaunchLocation GetBookmarkLaunchLocation() const;
 
   // Returns the index of the first hidden bookmark button. If all buttons are
@@ skipping 155 matching lines @@
 
   ObserverList<BookmarkBarViewObserver> observers_;
 
   // Factory used to delay showing of the drop menu.
   base::WeakPtrFactory<BookmarkBarView> show_folder_method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_