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

content/browser/renderer_host/offscreen_canvas_surface_impl.cc

Index: content/browser/renderer_host/offscreen_canvas_surface_impl.cc
diff --git a/content/browser/renderer_host/offscreen_canvas_surface_impl.cc b/content/browser/renderer_host/offscreen_canvas_surface_impl.cc
index bedfbdf9d8885415e120edb20148495e42e83551..27397ba33f3dda8f421e8ff74cfd257d1fdd4a9c 100644
--- a/content/browser/renderer_host/offscreen_canvas_surface_impl.cc
+++ b/content/browser/renderer_host/offscreen_canvas_surface_impl.cc
@@ -17,9 +17,12 @@
 namespace content {
 
 OffscreenCanvasSurfaceImpl::OffscreenCanvasSurfaceImpl(
+    const cc::FrameSinkId& parent_frame_sink_id,
     const cc::FrameSinkId& frame_sink_id,
     blink::mojom::OffscreenCanvasSurfaceClientPtr client)
-    : client_(std::move(client)), frame_sink_id_(frame_sink_id) {
+    : client_(std::move(client)),
+      frame_sink_id_(frame_sink_id),
+      parent_frame_sink_id_(parent_frame_sink_id) {
   OffscreenCanvasSurfaceManager::GetInstance()
       ->RegisterOffscreenCanvasSurfaceInstance(frame_sink_id_, this);
 }
@@ -33,12 +36,13 @@ OffscreenCanvasSurfaceImpl::~OffscreenCanvasSurfaceImpl() {
 
 // static
 void OffscreenCanvasSurfaceImpl::Create(
+    const cc::FrameSinkId& parent_frame_sink_id,
     const cc::FrameSinkId& frame_sink_id,
     blink::mojom::OffscreenCanvasSurfaceClientPtr client,
     blink::mojom::OffscreenCanvasSurfaceRequest request) {
   std::unique_ptr<OffscreenCanvasSurfaceImpl> impl =
-      base::MakeUnique<OffscreenCanvasSurfaceImpl>(frame_sink_id,
-                                                   std::move(client));
+      base::MakeUnique<OffscreenCanvasSurfaceImpl>(
+          parent_frame_sink_id, frame_sink_id, std::move(client));
   OffscreenCanvasSurfaceImpl* surface_service = impl.get();
   surface_service->binding_ =
       mojo::MakeStrongBinding(std::move(impl), std::move(request));