Implement WebGL's commit on the main thread

third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom

Index: third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
diff --git a/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom b/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
index 5faf670d949eda0b7e5f47befef9db02b0972595..19374b5900cc64ad2b961130e81e980b851a7814 100644
--- a/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
+++ b/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
@@ -5,6 +5,7 @@
 module blink.mojom;
 
 import "cc/ipc/compositor_frame.mojom";
+import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "cc/ipc/surface_id.mojom";
 import "cc/ipc/surface_sequence.mojom";
 
@@ -22,8 +23,12 @@ interface OffscreenCanvasSurface {
 // This interface is called from either worker or main thread in renderer, but
 // not both for the same OffscreenCanvas instance.
 interface OffscreenCanvasFrameReceiver {

[jbroman, 2016/09/19 15:12:10]

This interface is now unused.

[xidachen, 2016/09/19 18:25:11]

Done.

-
   SubmitCompositorFrame(cc.mojom.SurfaceId surface_id, cc.mojom.CompositorFrame compositor_frame);
+};
 
+interface OffscreenCanvasCompositorFrameSinkProvider {
+  CreateCompositorFrameSink(cc.mojom.SurfaceId surface_id,
+                            cc.mojom.MojoCompositorFrameSink& sink,
+                            cc.mojom.MojoCompositorFrameSinkClient client);
 };