Make OffscreenCanvas animation in sync with its placeholder canvas's parent frame rate

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 2eaca70e4ffb07a994d0f0fb219916bb4d07b929..afd4249aa1d9652c30f881fd7e7d60283a8d9be1 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
@@ -22,7 +22,8 @@ interface OffscreenCanvasSurfaceClient {
 };
 
 interface OffscreenCanvasSurfaceFactory {
-  CreateOffscreenCanvasSurface(cc.mojom.FrameSinkId frame_sink_id,
+  CreateOffscreenCanvasSurface(cc.mojom.FrameSinkId parent_frame_sink_id,
+                               cc.mojom.FrameSinkId frame_sink_id,
                                OffscreenCanvasSurfaceClient client,
                                OffscreenCanvasSurface& service);
 };