Adds BeginFrameControl via DevTools.

services/ui/ws/gpu_compositor_frame_sink.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 "services/ui/ws/gpu_compositor_frame_sink.h"
 
 #include "base/callback.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 126 matching lines @@
   } else {
     display_output_surface = base::MakeUnique<DirectOutputSurface>(
         context_provider, synthetic_begin_frame_source.get());
   }
 
   int max_frames_pending =
       display_output_surface->capabilities().max_frames_pending;
   DCHECK_GT(max_frames_pending, 0);
 
   std::unique_ptr<cc::DisplayScheduler> scheduler(
-      new cc::DisplayScheduler(synthetic_begin_frame_source.get(),
-                               task_runner_.get(), max_frames_pending));
+      new cc::DisplayScheduler(task_runner_.get(), max_frames_pending));
 
   display_.reset(new cc::Display(
       nullptr /* bitmap_manager */, gpu_memory_buffer_manager,
       cc::RendererSettings(), frame_sink_id_,
       std::move(synthetic_begin_frame_source),
       std::move(display_output_surface), std::move(scheduler),
       base::MakeUnique<cc::TextureMailboxDeleter>(task_runner_.get())));
   display_->Initialize(this, display_compositor_->manager());
   display_->SetVisible(true);
 }
@@ skipping 54 matching lines @@
 
   added_frame_observer_ = needs_begin_frame_;
   if (needs_begin_frame_)
     begin_frame_source_->AddObserver(this);
   else
     begin_frame_source_->RemoveObserver(this);
 }
 
 }  // namespace ws
 }  // namespace ui