Added LayerTreeHostImpl::layerTreeAsJson which serializes a layer tree

cc/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 CC_LAYER_IMPL_H_
 #define CC_LAYER_IMPL_H_
 
 #include <public/WebFilterOperations.h>
 #include <string>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
 #include "cc/draw_properties.h"
 #include "cc/input_handler.h"
 #include "cc/layer_animation_controller.h"
 #include "cc/region.h"
 #include "cc/render_pass.h"
 #include "cc/render_surface_impl.h"
 #include "cc/resource_provider.h"
 #include "cc/scoped_ptr_vector.h"
 #include "cc/shared_quad_state.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/transform.h"
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace cc {
 
 class LayerTreeHostImpl;
 class QuadSink;
 class Renderer;
 class ScrollbarAnimationController;
 class ScrollbarLayerImpl;
 class Layer;
 
 struct AppendQuadsData;
@@ skipping 195 matching lines @@
     void setDoubleSided(bool);
 
     void setTransform(const gfx::Transform&);
     const gfx::Transform& transform() const;
     bool transformIsAnimating() const;
 
     const gfx::RectF& updateRect() const { return m_updateRect; }
     void setUpdateRect(const gfx::RectF& updateRect) { m_updateRect = updateRect; }
 
     std::string layerTreeAsText() const;
+    virtual base::DictionaryValue* layerTreeAsJson() const;
 
     void setStackingOrderChanged(bool);
 
     bool layerPropertyChanged() const { return m_layerPropertyChanged || layerIsAlwaysDamaged(); }
     bool layerSurfacePropertyChanged() const;
 
     void resetAllChangeTrackingForSubtree();
 
     virtual bool layerIsAlwaysDamaged() const;
 
@@ skipping 134 matching lines @@
     // Group of properties that need to be computed based on the layer tree
     // hierarchy before layers can be drawn.
     DrawProperties<LayerImpl, RenderSurfaceImpl> m_drawProperties;
 
     DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }
 
 #endif  // CC_LAYER_IMPL_H_