Add a bare-bones extension shelf that displays extension items on OS X.

chrome/browser/renderer_host/render_widget_host_view_mac.h

 // Copyright (c) 2006-2008 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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
@@ skipping 14 matching lines @@
 @end
 
 // This is the view that lives in the Cocoa view hierarchy. In Windows-land,
 // RenderWidgetHostViewWin is both the view and the delegate. We split the roles
 // but that means that the view needs to own the delegate and will dispose of it
 // when it's removed from the view system.
 
 @interface RenderWidgetHostViewCocoa
     : BaseView <RenderWidgetHostViewMacOwner, NSTextInput, NSChangeSpelling> {
  @private
-  RenderWidgetHostViewMac* renderWidgetHostView_;
+  RenderWidgetHostViewMac* renderWidgetHostView_;  // Owned by us.
   BOOL canBeKeyView_;
   BOOL closeOnDeactivate_;
   scoped_ptr<RWHVMEditCommandHelper> editCommand_helper_;
 
   // These are part of the magic tooltip code from WebKit's WebHTMLView:
   id trackingRectOwner_;              // (not retained)
   void *trackingRectUserData_;
   NSTrackingRectTag lastToolTipTag_;
   NSString* toolTip_;
 }
@@ skipping 54 matching lines @@
   virtual void Destroy();
   virtual void SetTooltipText(const std::wstring& tooltip_text);
   virtual BackingStore* AllocBackingStore(const gfx::Size& size);
   virtual void ShowPopupWithItems(gfx::Rect bounds,
                                   int item_height,
                                   int selected_item,
                                   const std::vector<WebMenuItem>& items);
   virtual gfx::Rect GetWindowRect();
   virtual gfx::Rect GetRootWindowRect();
   virtual void SetActive(bool active);
+  virtual void SetBackground(const SkBitmap& background);
 
   void KillSelf();
 
   void set_parent_view(BaseView* parent_view) { parent_view_ = parent_view; }
 
   // These member variables should be private, but the associated ObjC class
   // needs access to them and can't be made a friend.
 
   // The associated Model.  Can be NULL if Destroy() is called when
   // someone (other than superview) has retained |cocoa_view_|.
@@ skipping 81 matching lines @@
   // Factory used to safely scope delayed calls to ShutdownHost().
   ScopedRunnableMethodFactory<RenderWidgetHostViewMac> shutdown_factory_;
 
   // Used for positioning a popup menu.
   BaseView* parent_view_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_