[cc] Route LayerImpl::layerTreeHostImpl() calls through LayerTreeImpl

cc/debug_rect_history.h

 // Copyright 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 CC_DEBUG_RECT_HISTORY_H_
 #define CC_DEBUG_RECT_HISTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include <vector>
 
 namespace cc {
 
 class LayerImpl;
-struct LayerTreeDebugState;
+class LayerTreeDebugState;
 
 // There are currently six types of debug rects:
 //
 // - Paint rects (update rects): regions of a layer that needed to be re-uploaded to the
 //   texture resource; in most cases implying that they had to be repainted, too.
 //
 // - Property-changed rects: enclosing bounds of layers that cause changes to the screen
 //   even if the layer did not change internally. (For example, if the layer's opacity or
 //   position changes.)
 //
@@ skipping 46 matching lines @@
     void saveNonOccludingRects(const std::vector<gfx::Rect>& nonOccludingScreenSpaceRects);
 
     std::vector<DebugRect> m_debugRects;
 
     DISALLOW_COPY_AND_ASSIGN(DebugRectHistory);
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_RECT_HISTORY_H_