cc: Send all begin frames using a PostTask.

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 68 matching lines @@
 
   std::unique_ptr<CompositorTimingHistory> compositor_timing_history(
       new CompositorTimingHistory(
           scheduler_settings.using_synchronous_renderer_compositor,
           CompositorTimingHistory::RENDERER_UMA,
           rendering_stats_instrumentation_));
 
   BeginFrameSource* frame_source = external_begin_frame_source_.get();
   if (!scheduler_settings.throttle_frame_production) {
     // Unthrottled source takes precedence over external sources.
-    unthrottled_begin_frame_source_.reset(
-        new BackToBackBeginFrameSource(base::MakeUnique<DelayBasedTimeSource>(
-            task_runner_provider_->ImplThreadTaskRunner())));
+    unthrottled_begin_frame_source_.reset(new BackToBackBeginFrameSource(
+        task_runner_provider_->ImplThreadTaskRunner()));
     frame_source = unthrottled_begin_frame_source_.get();
   }
   if (!frame_source) {
-    synthetic_begin_frame_source_.reset(
-        new DelayBasedBeginFrameSource(base::MakeUnique<DelayBasedTimeSource>(
-            task_runner_provider_->ImplThreadTaskRunner())));
+    synthetic_begin_frame_source_.reset(new DelayBasedBeginFrameSource(
+        task_runner_provider_->ImplThreadTaskRunner()));
     frame_source = synthetic_begin_frame_source_.get();
   }
   scheduler_ =
       Scheduler::Create(this, scheduler_settings, layer_tree_host_id_,
                         task_runner_provider_->ImplThreadTaskRunner(),
                         frame_source, std::move(compositor_timing_history));
 
   DCHECK_EQ(scheduler_->visible(), layer_tree_host_impl_->visible());
 }
 
@@ skipping 572 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