cc: Make BackToBackBeginFrameSource a SyntheticBeginFrameSource.

cc/surfaces/display.cc

 // Copyright 2014 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/surfaces/display.h"
 
 #include <stddef.h>
 
+#include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/direct_renderer.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/renderer_settings.h"
 #include "cc/output/software_renderer.h"
+#include "cc/scheduler/delay_based_time_source.h"
 #include "cc/surfaces/display_client.h"
 #include "cc/surfaces/display_scheduler.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_aggregator.h"
 #include "cc/surfaces/surface_manager.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "ui/gfx/buffer_types.h"
 
 #if defined(ENABLE_VULKAN)
 #include "cc/output/vulkan_renderer.h"
@@ skipping 50 matching lines @@
     // WebView doesn't have a task runner or a real begin frame source,
     // so just create something fake here.
     internal_begin_frame_source_.reset(new EmptyBeginFrameSource());
     vsync_begin_frame_source_ = internal_begin_frame_source_.get();
     observed_begin_frame_source_ = vsync_begin_frame_source_;
   } else {
     DCHECK(vsync_begin_frame_source_);
 
     observed_begin_frame_source_ = vsync_begin_frame_source_;
     if (settings_.disable_display_vsync) {
-      internal_begin_frame_source_.reset(
-          new BackToBackBeginFrameSource(task_runner_));
+      internal_begin_frame_source_.reset(new BackToBackBeginFrameSource(
+          base::MakeUnique<DelayBasedTimeSource>(task_runner_)));
       observed_begin_frame_source_ = internal_begin_frame_source_.get();
     }
   }
 
   scheduler_.reset(
       new DisplayScheduler(this, observed_begin_frame_source_, task_runner_,
                            output_surface_->capabilities().max_frames_pending));
   surface_manager_->RegisterBeginFrameSource(observed_begin_frame_source_,
                                              compositor_surface_namespace_);
 }
@@ skipping 324 matching lines @@
 
   if (surface_id == current_surface_id_)
     UpdateRootSurfaceResourcesLocked();
 }
 
 SurfaceId Display::CurrentSurfaceId() {
   return current_surface_id_;
 }
 
 }  // namespace cc