cc: Make BackToBackBeginFrameSource a SyntheticBeginFrameSource.

cc/test/pixel_test_delegating_output_surface.cc

 // Copyright 2016 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/test/pixel_test_delegating_output_surface.h"
 
 #include <stdint.h>
 #include <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/direct_renderer.h"
+#include "cc/scheduler/delay_based_time_source.h"
 #include "cc/test/begin_frame_args_test.h"
 #include "cc/test/pixel_test_output_surface.h"
 #include "cc/test/pixel_test_software_output_device.h"
 #include "cc/test/test_in_process_context_provider.h"
 
 static constexpr uint32_t kCompositorSurfaceNamespace = 1;
 
 namespace cc {
 
 PixelTestDelegatingOutputSurface::PixelTestDelegatingOutputSurface(
@@ skipping 58 matching lines @@
   display_.reset(new Display(surface_manager_.get(), shared_bitmap_manager_,
                              gpu_memory_buffer_manager_, RendererSettings(),
                              surface_id_allocator_->id_namespace(), task_runner,
                              std::move(output_surface)));
   display_->SetEnlargePassTextureAmountForTesting(enlarge_pass_texture_amount_);
 
   if (synchronous_composite_) {
     bool init = display_->InitializeSynchronous(&display_client_);
     CHECK(init);
   } else {
-    begin_frame_source_.reset(new BackToBackBeginFrameSource(task_runner));
+    begin_frame_source_.reset(new BackToBackBeginFrameSource(
+        base::MakeUnique<DelayBasedTimeSource>(task_runner)));
     display_->SetBeginFrameSource(begin_frame_source_.get());
 
     bool init = display_->Initialize(&display_client_);
     CHECK(init);
   }
 
   return true;
 }
 
 void PixelTestDelegatingOutputSurface::DetachFromClient() {
@@ skipping 58 matching lines @@
   ack.resources = resources;
   client_->ReclaimResources(&ack);
 }
 
 void PixelTestDelegatingOutputSurface::SetBeginFrameSource(
     BeginFrameSource* begin_frame_source) {
   client_->SetBeginFrameSource(begin_frame_source);
 }
 
 }  // namespace cc