Reland Submit Compositor Frame from OffscreenCanvas on main

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 d3f3aa8a17378716edff9265ca798e66b378f475..55d34ee9a91eb0dfe0846c773559bcbc3711e2dd 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
@@ -18,9 +18,14 @@ interface OffscreenCanvasSurface {
 
   Require(cc.mojom.SurfaceId surface_id, cc.mojom.SurfaceSequence sequence);
   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.
+// TODO(xlai): Make commit() work for worker. See crbug.com/563858.
+interface OffscreenCanvasFrameReceiver {
+
+  SubmitCompositorFrame(cc.mojom.SurfaceId surface_id, cc.mojom.CompositorFrame compositor_frame);
 
-  // TODO(563852): Move this function to be in an interface shared by both
-  // worker thread and main thread.
-  // SubmitCompositorFrame(cc.mojom.CompositorFrame compositor_frame);
 };