cc: Make separate interface for BeginFrame ipc from OutputSurface

cc/trees/layer_tree_host_unittest_no_message_loop.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 "base/message_loop/message_loop_proxy.h"
 #include "base/threading/simple_thread.h"
 #include "cc/layers/delegated_frame_provider.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
 #include "cc/layers/delegated_renderer_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/output_surface_client.h"
 #include "cc/resources/resource_provider.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "cc/test/fake_delegated_renderer_layer.h"
 #include "cc/test/test_context_provider.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/frame_time.h"
 
 namespace cc {
@@ skipping 66 matching lines @@
     EXPECT_FALSE(base::MessageLoopProxy::current().get());
   }
 
  protected:
   virtual void RunTestWithoutMessageLoop() = 0;
 
   void SetupLayerTreeHost() {
     LayerTreeSettings settings;
     settings.single_thread_proxy_scheduler = false;
     layer_tree_host_ = LayerTreeHost::CreateSingleThreaded(
-        this, this, NULL, NULL, settings, NULL);
+        this, this, nullptr, nullptr, settings, nullptr, nullptr);
     layer_tree_host_->SetViewportSize(size_);
     layer_tree_host_->SetRootLayer(root_layer_);
   }
 
   void Composite() {
     did_commit_ = false;
     did_commit_and_draw_frame_ = false;
     layer_tree_host_->Composite(gfx::FrameTime::Now());
     EXPECT_TRUE(did_initialize_output_surface_);
     EXPECT_TRUE(did_commit_);
@@ skipping 116 matching lines @@
   scoped_refptr<DelegatedFrameProvider> frame_provider_;
   scoped_refptr<DelegatedRendererLayer> delegated_layer_;
 };
 
 TEST_F(LayerTreeHostNoMessageLoopDelegatedLayer, SingleDelegatedLayer) {
   RunTest();
 }
 
 }  // namespace
 }  // namespace cc