Get rid of virtual Display::CreateScheduler.

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>
 
@@ skipping 63 matching lines @@
         new TestInProcessContextProvider(nullptr));
     bool flipped_output_surface = false;
     output_surface = base::MakeUnique<PixelTestOutputSurface>(
         std::move(context), nullptr, flipped_output_surface, nullptr);
   }
   output_surface->set_surface_expansion_size(surface_expansion_size);
 
   auto* task_runner = base::ThreadTaskRunnerHandle::Get().get();
   CHECK(task_runner);
 
+  if (!synchronous_composite_)
+    begin_frame_source_.reset(new BackToBackBeginFrameSource(task_runner));
+  DCHECK_EQ(synchronous_composite_, !begin_frame_source_);
+
   display_.reset(new Display(surface_manager_.get(), shared_bitmap_manager_,
                              gpu_memory_buffer_manager_, RendererSettings(),
                              surface_id_allocator_->id_namespace(), task_runner,
+                             begin_frame_source_.get(),
                              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));
-    display_->SetBeginFrameSource(begin_frame_source_.get());
-
-    bool init = display_->Initialize(&display_client_);
-    CHECK(init);
-  }
-
+  bool init = display_->Initialize(&display_client_);
+  CHECK(init);
   return true;
 }
 
 void PixelTestDelegatingOutputSurface::DetachFromClient() {
   if (!delegated_surface_id_.is_null())
     surface_factory_->Destroy(delegated_surface_id_);
   surface_manager_->UnregisterSurfaceFactoryClient(
       surface_id_allocator_->id_namespace());
 
   display_ = nullptr;
@@ skipping 52 matching lines @@
   ack.resources = resources;
   client_->ReclaimResources(&ack);
 }
 
 void PixelTestDelegatingOutputSurface::SetBeginFrameSource(
     BeginFrameSource* begin_frame_source) {
   client_->SetBeginFrameSource(begin_frame_source);
 }
 
 }  // namespace cc