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..f4e4448d561060e6fd9d53c0f2bae50a8f2d5c4e 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";
 
@@ -19,11 +20,9 @@ interface OffscreenCanvasSurface {
   Satisfy(cc.mojom.SurfaceSequence sequence);
 };
 
-// This interface is called from either worker or main thread in renderer, but
-// not both for the same OffscreenCanvas instance.
-interface OffscreenCanvasFrameReceiver {
-
-  SubmitCompositorFrame(cc.mojom.SurfaceId surface_id, cc.mojom.CompositorFrame compositor_frame);
-
+interface OffscreenCanvasCompositorFrameSinkProvider {
+  CreateCompositorFrameSink(cc.mojom.SurfaceId surface_id,
+                            cc.mojom.MojoCompositorFrameSinkClient client,
+                            cc.mojom.MojoCompositorFrameSink& sink);
 };