cc: Make BackToBackBeginFrameSource a SyntheticBeginFrameSource.

cc/surfaces/surface_display_output_surface_unittest.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/surfaces/surface_display_output_surface.h"
 
 #include <memory>
 
 #include "cc/output/renderer_settings.h"
 #include "cc/scheduler/begin_frame_source.h"
+#include "cc/scheduler/delay_based_time_source.h"
 #include "cc/surfaces/display.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_output_surface_client.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "cc/test/test_context_provider.h"
 #include "cc/test/test_gpu_memory_buffer_manager.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 class SurfaceDisplayOutputSurfaceTest : public testing::Test {
  public:
   SurfaceDisplayOutputSurfaceTest()
       : now_src_(new base::SimpleTestTickClock()),
         task_runner_(new OrderedSimpleTaskRunner(now_src_.get(), true)),
-        begin_frame_source_(new BackToBackBeginFrameSource(task_runner_.get())),
+        begin_frame_source_(new BackToBackBeginFrameSource(
+            base::MakeUnique<DelayBasedTimeSource>(task_runner_.get()))),
         allocator_(0),
         display_size_(1920, 1080),
         display_rect_(display_size_),
         context_provider_(TestContextProvider::Create()) {
     surface_manager_.RegisterSurfaceIdNamespace(allocator_.id_namespace());
 
     std::unique_ptr<FakeOutputSurface> display_output_surface =
         FakeOutputSurface::Create3d();
     display_output_surface_ = display_output_surface.get();
     display_output_surface_->set_max_frames_pending(2);
@@ skipping 98 matching lines @@
   EXPECT_EQ(1u, display_output_surface_->num_sent_frames());
 
   SwapBuffersWithDamage(gfx::Rect());
   EXPECT_EQ(1u, display_output_surface_->num_sent_frames());
   task_runner_->RunUntilIdle();
   EXPECT_EQ(1u, display_output_surface_->num_sent_frames());
 }
 
 }  // namespace
 }  // namespace cc