cc: Introduce BeginFrame sequence numbers and acknowledgements.

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 "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
@@ skipping 46 matching lines @@
 void OffscreenCanvasCompositorFrameSink::SetNeedsBeginFrame(
     bool needs_begin_frame) {
   NOTIMPLEMENTED();
 }
 
 void OffscreenCanvasCompositorFrameSink::EvictFrame() {
   // TODO(fsamuel, staraz): Implement this
   NOTIMPLEMENTED();
 }
 
+void OffscreenCanvasCompositorFrameSink::BeginFrameDidNotDraw(
+    const cc::BeginFrameAck& ack) {
+  NOTIMPLEMENTED();
+}
+
 void OffscreenCanvasCompositorFrameSink::ReturnResources(
     const cc::ReturnedResourceArray& resources) {
   if (resources.empty())
     return;
 
   if (!ack_pending_count_ && client_) {
     client_->ReclaimResources(resources);
     return;
   }
 
@@ skipping 14 matching lines @@
   client_->DidReceiveCompositorFrameAck();
   DCHECK_GT(ack_pending_count_, 0);
   if (!surface_returned_resources_.empty()) {
     client_->ReclaimResources(surface_returned_resources_);
     surface_returned_resources_.clear();
   }
   ack_pending_count_--;
 }
 
 }  // namespace content