Added LayerTreeHostImpl::layerTreeAsJson which serializes a layer tree

cc/layer_tree_host_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 CC_LAYER_TREE_HOST_IMPL_H_
 #define CC_LAYER_TREE_HOST_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
@@ skipping 172 matching lines @@
     virtual void onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds) OVERRIDE;
 
     // LayerTreeImplClient implementation.
     virtual void OnCanDrawStateChangedForTree(LayerTreeImpl*) OVERRIDE;
 
     // Implementation
     bool canDraw();
     OutputSurface* outputSurface() const;
 
     std::string layerTreeAsText() const;
+    std::string layerTreeAsJson() const;
 
     void finishAllRendering();
     int sourceAnimationFrameNumber() const;
 
     bool initializeRenderer(scoped_ptr<OutputSurface>);
     bool isContextLost();
     TileManager* tileManager() { return m_tileManager.get(); }
     Renderer* renderer() { return m_renderer.get(); }
     const RendererCapabilities& rendererCapabilities() const;
 
@@ skipping 188 matching lines @@
 #if !defined(NDEBUG)
     AnimationControllerSet m_allAnimationControllers;
 #endif
 
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_HOST_IMPL_H_