cc: Add support for sending BeginFrames for video.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <set>
@@ skipping 1635 matching lines @@
   UpdateCurrentBeginFrameArgs(args);
   // Cache the begin impl frame interval
   begin_impl_frame_interval_ = args.interval;
 
   if (is_likely_to_require_a_draw_) {
     // Optimistically schedule a draw. This will let us expect the tile manager
     // to complete its work so that we can draw new tiles within the impl frame
     // we are beginning now.
     SetNeedsRedraw();
   }
+
+  for (auto& it : video_frame_controllers_)
+    it->OnBeginFrame(args);
 }
 
 void LayerTreeHostImpl::UpdateViewportContainerSizes() {
   LayerImpl* inner_container = active_tree_->InnerViewportContainerLayer();
   LayerImpl* outer_container = active_tree_->OuterViewportContainerLayer();
 
   if (!inner_container)
     return;
 
   // TODO(bokan): This code is currently specific to top controls. It should be
@@ skipping 1397 matching lines @@
 void LayerTreeHostImpl::PostDelayedScrollbarAnimationTask(
     const base::Closure& task,
     base::TimeDelta delay) {
   client_->PostDelayedAnimationTaskOnImplThread(task, delay);
 }
 
 void LayerTreeHostImpl::SetNeedsRedrawForScrollbarAnimation() {
   SetNeedsRedraw();
 }
 
+void LayerTreeHostImpl::AddVideoFrameController(
+    VideoFrameController* controller) {
+  bool was_empty = video_frame_controllers_.empty();
+  video_frame_controllers_.insert(controller);
+  if (was_empty)
+    client_->SetVideoNeedsBeginFrames(true);
+}
+
+void LayerTreeHostImpl::RemoveVideoFrameController(
+    VideoFrameController* controller) {
+  video_frame_controllers_.erase(controller);
+  if (video_frame_controllers_.empty())
+    client_->SetVideoNeedsBeginFrames(false);
+}
+
 void LayerTreeHostImpl::SetTreePriority(TreePriority priority) {
   if (!tile_manager_)
     return;
 
   if (global_tile_state_.tree_priority == priority)
     return;
   global_tile_state_.tree_priority = priority;
   DidModifyTilePriorities();
 }
 
@@ skipping 266 matching lines @@
   new_target.SetToMin(layer_impl->MaxScrollOffset());
 
   curve->UpdateTarget(
       animation->TrimTimeToCurrentIteration(CurrentBeginFrameArgs().frame_time)
           .InSecondsF(),
       new_target);
 
   return true;
 }
 }  // namespace cc