Hook up ui::Compositor to Display's BeginFrameSource

cc/trees/proxy_impl.cc

 // Copyright 2015 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/proxy_impl.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 283 matching lines @@
   if (!synthetic_begin_frame_source_)
     return;
 
   if (interval == base::TimeDelta()) {
     // TODO(brianderson): We should not be receiving 0 intervals.
     interval = BeginFrameArgs::DefaultInterval();
   }
   synthetic_begin_frame_source_->OnUpdateVSyncParameters(timebase, interval);
 }
 
+void ProxyImpl::SetBeginFrameSource(BeginFrameSource* source) {
+  // TODO(enne): this overrides any preexisting begin frame source.  Those
+  // other sources will eventually be removed and this will be the only path.
+  scheduler_->SetBeginFrameSource(source);
+}
+
 void ProxyImpl::SetEstimatedParentDrawTime(base::TimeDelta draw_time) {
   DCHECK(IsImplThread());
   scheduler_->SetEstimatedParentDrawTime(draw_time);
 }
 
 void ProxyImpl::DidSwapBuffersOnImplThread() {
   DCHECK(IsImplThread());
   scheduler_->DidSwapBuffers();
 }
 
@@ skipping 366 matching lines @@
 bool ProxyImpl::IsMainThreadBlocked() const {
   return task_runner_provider_->IsMainThreadBlocked();
 }
 
 ProxyImpl::BlockedMainCommitOnly& ProxyImpl::blocked_main_commit() {
   DCHECK(IsMainThreadBlocked() && commit_completion_event_);
   return main_thread_blocked_commit_vars_unsafe_;
 }
 
 }  // namespace cc