Enable disabling WebCore::GraphicsContext in telemetry.

ui/compositor/layer.h

 // Copyright (c) 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 UI_COMPOSITOR_LAYER_H_
 #define UI_COMPOSITOR_LAYER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 296 matching lines @@
   // not apply to the canvas passed to the pending draw.
   void set_scale_content(bool scale_content) { scale_content_ = scale_content; }
 
   // Returns true if the layer scales its content.
   bool scale_content() const { return scale_content_; }
 
   // Requets a copy of the layer's output as a texture or bitmap.
   void RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request);
 
   // ContentLayerClient
-  virtual void PaintContents(
-      SkCanvas* canvas, const gfx::Rect& clip, gfx::RectF* opaque) OVERRIDE;
+  virtual void PaintContents(SkCanvas* canvas,
+                             const gfx::Rect& clip,
+                             gfx::RectF* opaque,
+                             bool disableContext) OVERRIDE;
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
   virtual bool FillsBoundsCompletely() const OVERRIDE;
 
   cc::Layer* cc_layer() { return cc_layer_; }
 
   // TextureLayerClient
   virtual bool PrepareTextureMailbox(
       cc::TextureMailbox* mailbox,
       scoped_ptr<cc::SingleReleaseCallback>* release_callback,
       bool use_shared_memory) OVERRIDE;
@@ skipping 161 matching lines @@
   // The size of the frame or texture in DIP, set when SetShowDelegatedContent
   // or SetTextureMailbox was called.
   gfx::Size frame_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_