cc: Add some impl-side painting stub classes and APIs

webkit/compositor_bindings/web_content_layer_impl.h

 // Copyright 2011 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 WebContentLayerImpl_h
 #define WebContentLayerImpl_h
 
-// FIXME: WebContentLayer should forward declare this
-namespace WebKit {
-class WebLayer;
-}
-
 #include "base/memory/scoped_ptr.h"
 #include "cc/content_layer_client.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebContentLayer.h"
 #include "web_layer_impl.h"
 
 namespace cc {
 class IntRect;
 class FloatRect;
 }
 
@@ skipping 21 matching lines @@
     virtual void paintContents(SkCanvas*, const gfx::Rect& clip, gfx::RectF& opaque) OVERRIDE;
 
     scoped_ptr<WebLayerImpl> m_layer;
     WebContentLayerClient* m_client;
     bool m_drawsContent;
 };
 
 } // namespace WebKit
 
 #endif // WebContentLayerImpl_h