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 ae0489b0074bf8a20ac0a9fc2d53040dcfaa99f2..e10437a71ec5716a7ee84a9b27dc3721fdc9706c 100644
--- a/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h
+++ b/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h
@@ -5,6 +5,8 @@
 #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 "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
@@ -12,7 +14,8 @@
 namespace content {
 
 class OffscreenCanvasFrameReceiverImpl
-    : public blink::mojom::OffscreenCanvasFrameReceiver {
+    : public blink::mojom::OffscreenCanvasFrameReceiver,
+      public cc::SurfaceFactoryClient {
  public:
   static void Create(mojo::InterfaceRequest<
                      blink::mojom::OffscreenCanvasFrameReceiver> request);
@@ -20,12 +23,20 @@ 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:
   ~OffscreenCanvasFrameReceiverImpl() override;
   explicit OffscreenCanvasFrameReceiverImpl(
       mojo::InterfaceRequest<blink::mojom::OffscreenCanvasFrameReceiver>
           request);
 
+  cc::SurfaceId surface_id_;
+  std::unique_ptr<cc::SurfaceFactory> surface_factory_;
   mojo::StrongBinding<blink::mojom::OffscreenCanvasFrameReceiver> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasFrameReceiverImpl);