Allow out-of-process iframes to render to compositing surfaces.

content/renderer/render_frame_proxy.h

Index: content/renderer/render_frame_proxy.h
diff --git a/content/renderer/render_frame_proxy.h b/content/renderer/render_frame_proxy.h
index a5e431413f16f44773653c41c2e6100bd4eb6376..927ea9e39911a8f307cc6c6174f009d3119f44fe 100644
--- a/content/renderer/render_frame_proxy.h
+++ b/content/renderer/render_frame_proxy.h
@@ -21,6 +21,11 @@ namespace blink {
 class WebInputEvent;
 }
 
+namespace cc {
+struct SurfaceId;
+struct SurfaceSequence;
+}
+
 namespace content {
 
 class ChildFrameCompositingHelper;
@@ -141,6 +146,10 @@ class CONTENT_EXPORT RenderFrameProxy
   void OnDeleteProxy();
   void OnChildFrameProcessGone();
   void OnCompositorFrameSwapped(const IPC::Message& message);
+  void OnSetChildFrameSurface(const cc::SurfaceId& surface_id,
+                              const gfx::Size& frame_size,
+                              float scale_factor,
+                              const cc::SurfaceSequence& sequence);
   void OnDisownOpener();
   void OnDidStopLoading();
   void OnDidUpdateSandboxFlags(SandboxFlags flags);