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

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h"
 
 #include "base/memory/ptr_util.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/renderer_host/offscreen_canvas_compositor_frame_sink_provider_impl.h"
@@ skipping 12 matching lines @@
                frame_sink_id,
                nullptr,
                nullptr),
       client_(std::move(client)),
       binding_(this, std::move(request)) {
   binding_.set_connection_error_handler(
       base::Bind(&OffscreenCanvasCompositorFrameSink::OnClientConnectionLost,
                  base::Unretained(this)));
 }
 
-OffscreenCanvasCompositorFrameSink::~OffscreenCanvasCompositorFrameSink() {}
+OffscreenCanvasCompositorFrameSink::~OffscreenCanvasCompositorFrameSink() {
+  provider_->OnCompositorFrameSinkClientDestroyed(support_.frame_sink_id());
+}
 
 void OffscreenCanvasCompositorFrameSink::SetNeedsBeginFrame(
     bool needs_begin_frame) {
   support_.SetNeedsBeginFrame(needs_begin_frame);
 }
 
 void OffscreenCanvasCompositorFrameSink::SubmitCompositorFrame(
     const cc::LocalSurfaceId& local_surface_id,
     cc::CompositorFrame frame) {
   // TODO(samans): This will need to do something similar to
@@ skipping 37 matching lines @@
   if (client_)
     client_->WillDrawSurface();
 }
 
 void OffscreenCanvasCompositorFrameSink::OnClientConnectionLost() {
   provider_->OnCompositorFrameSinkClientConnectionLost(
       support_.frame_sink_id());
 }
 
 }  // namespace content