Add abstractions that let embedders drive tests of WebContents.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 // The BookmarkBarToolbarView is responsible for drawing the background of the
 // BookmarkBar's toolbar in either of its two display modes - permanently
 // attached (slimline with a stroke at the bottom edge) or New Tab Page style
 // (padded with a round rect border and the New Tab Page theme behind).
 
 #ifndef CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_TOOLBAR_VIEW_H_
 #define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_TOOLBAR_VIEW_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/ui/cocoa/animatable_view.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_state.h"
 
 @class BookmarkBarView;
-class TabContents;
 
 namespace ui {
 class ThemeProvider;
 }
 
 // An interface to allow mocking of a BookmarkBarController by the
 // BookmarkBarToolbarView.
 @protocol BookmarkBarToolbarViewController <BookmarkBarState>
 // Displaying the bookmark toolbar background in bubble (floating) mode requires
 // the size of the currently selected tab to properly calculate where the
 // background image is joined.
 - (int)currentTabContentsHeight;
 
 // Current theme provider, passed to the cross platform NtpBackgroundUtil class.
 - (ui::ThemeProvider*)themeProvider;
 
 @end
 
 @interface BookmarkBarToolbarView : AnimatableView {
  @private
    // The controller which tells us how we should be drawing (as normal or as a
    // floating bar).
    IBOutlet id<BookmarkBarToolbarViewController> controller_;
 }
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_TOOLBAR_VIEW_H_