Added LayerTreeHostImpl::layerTreeAsJson which serializes a layer tree

cc/nine_patch_layer_impl.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_NINE_PATCH_LAYER_IMPL_H_
 #define CC_NINE_PATCH_LAYER_IMPL_H_
 
 #include "cc/cc_export.h"
 #include "cc/layer_impl.h"
 #include "cc/resource_provider.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/rect.h"
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace cc {
 
 class CC_EXPORT NinePatchLayerImpl : public LayerImpl {
 public:
     static scoped_ptr<NinePatchLayerImpl> create(int id)
     {
         return make_scoped_ptr(new NinePatchLayerImpl(id));
     }
     virtual ~NinePatchLayerImpl();
 
     void setResourceId(unsigned id) { m_resourceId = id; }
     void setLayout(const gfx::Size& imageBounds, const gfx::Rect& aperture);
 
     virtual void willDraw(ResourceProvider*) OVERRIDE;
     virtual void appendQuads(QuadSink&, AppendQuadsData&) OVERRIDE;
     virtual void didDraw(ResourceProvider*) OVERRIDE;
     virtual ResourceProvider::ResourceId contentsResourceId() const OVERRIDE;
     virtual void dumpLayerProperties(std::string*, int indent) const OVERRIDE;
     virtual void didLoseOutputSurface() OVERRIDE;
 
+    virtual base::DictionaryValue* layerTreeAsJson() const OVERRIDE;
+
 protected:
     explicit NinePatchLayerImpl(int id);
 
 private:
     virtual const char* layerTypeAsString() const OVERRIDE;
 
     // The size of the NinePatch bitmap in pixels.
     gfx::Size m_imageBounds;
 
     // The transparent center region that shows the parent layer's contents in image space.
     gfx::Rect m_imageAperture;
 
     ResourceProvider::ResourceId m_resourceId;
 };
 
 }  // namespace cc
 
 #endif  // CC_NINE_PATCH_LAYER_IMPL_H_