Add flag for drawing layers to screen with Ganesh

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index c83169dfc6acd3b2b4925c7ce0a9bbd476613f3f..b81ae042abbaecc4f334053435a7efa1f8815b2b 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -45,7 +45,8 @@ class CC_EXPORT GLRenderer
   static scoped_ptr<GLRenderer> Create(RendererClient* client,
                                        OutputSurface* output_surface,
                                        ResourceProvider* resource_provider,
-                                       int highp_threshold_min);
+                                       int highp_threshold_min,
+                                       bool use_skia_gpu_backend);
 
   virtual ~GLRenderer();
 
@@ -77,6 +78,8 @@ class CC_EXPORT GLRenderer
                           const char* file,
                           int line);
 
+  bool CanUseSkiaGPUBackend() const;
+
  protected:
   GLRenderer(RendererClient* client,
              OutputSurface* output_surface,
@@ -85,6 +88,7 @@ class CC_EXPORT GLRenderer
 
   bool IsBackbufferDiscarded() const { return is_backbuffer_discarded_; }
   bool Initialize();
+  void InitializeGrContext();
 
   const gfx::QuadF& SharedGeometryQuad() const { return shared_geometry_quad_; }
   const GeometryBinding* SharedGeometry() const {
@@ -151,6 +155,8 @@ class CC_EXPORT GLRenderer
                         const YUVVideoDrawQuad* quad);
   void DrawPictureQuad(const DrawingFrame* frame,
                        const PictureDrawQuad* quad);
+  void DrawPictureQuadDirectToBackbuffer(const DrawingFrame* frame,
+                                         const PictureDrawQuad* quad);
 
   void SetShaderOpacity(float opacity, int alpha_location);
   void SetShaderQuadF(const gfx::QuadF& quad, int quad_location);
@@ -206,6 +212,9 @@ class CC_EXPORT GLRenderer
       const CopyRenderPassCallback& callback,
       bool success);
 
+  void ReinitializeGrCanvas();
+  void ReinitializeGLState();
+
   // WebKit::
   // WebGraphicsContext3D::WebGraphicsMemoryAllocationChangedCallbackCHROMIUM
   // implementation.
@@ -392,6 +401,9 @@ class CC_EXPORT GLRenderer
   OutputSurface* output_surface_;
   WebKit::WebGraphicsContext3D* context_;
 
+  skia::RefPtr<GrContext> gr_context_;
+  skia::RefPtr<SkCanvas> sk_canvas_;
+
   gfx::Rect swap_buffer_rect_;
   gfx::Rect scissor_rect_;
   bool is_viewport_changed_;