Make Surface creation lazy for OffscreenCanvasFrameReceiverImpl

content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h

Index: content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h
diff --git a/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h b/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h
index c9e7de3a738956ee1008c678f0b9ab66fc54de6b..c74ded0e54281007a3ffc0160a10f5df62c12209 100644
--- a/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h
+++ b/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h
@@ -5,12 +5,15 @@
 #ifndef CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_FRAME_RECEIVER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_FRAME_RECEIVER_IMPL_H_
 
+#include "cc/surfaces/surface_factory.h"
+#include "cc/surfaces/surface_factory_client.h"
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
 
 namespace content {
 
 class OffscreenCanvasFrameReceiverImpl
-    : public blink::mojom::OffscreenCanvasFrameReceiver {
+    : public blink::mojom::OffscreenCanvasFrameReceiver,
+      public cc::SurfaceFactoryClient {
  public:
   OffscreenCanvasFrameReceiverImpl();
   ~OffscreenCanvasFrameReceiverImpl() override;
@@ -20,7 +23,16 @@ class OffscreenCanvasFrameReceiverImpl
   void SubmitCompositorFrame(const cc::SurfaceId& surface_id,
                              cc::CompositorFrame frame) override;
 
+  // cc::SurfaceFactoryClient implementation.
+  void ReturnResources(const cc::ReturnedResourceArray& resources) override;
+  void WillDrawSurface(const cc::SurfaceId& id,
+                       const gfx::Rect& damage_rect) override;
+  void SetBeginFrameSource(cc::BeginFrameSource* begin_frame_source) override;
+
  private:
+  cc::SurfaceId surface_id_;
+  std::unique_ptr<cc::SurfaceFactory> surface_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasFrameReceiverImpl);
 };