ozone: Add post message loop initialization hook

ui/ozone/platform/test/ozone_platform_test.cc

 // Copyright 2013 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 "ui/ozone/platform/test/ozone_platform_test.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "ui/base/cursor/ozone/bitmap_cursor_factory_ozone.h"
 #include "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
@@ skipping 73 matching lines @@
 
     input_controller_ = CreateStubInputController();
     cursor_factory_ozone_.reset(new BitmapCursorFactoryOzone);
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
   }
 
   void InitializeGPU() override {
     gpu_platform_support_.reset(CreateStubGpuPlatformSupport());
   }
 
+  void InitializeGpuPostMainLoop() override {}
+
  private:
   scoped_ptr<TestWindowManager> window_manager_;
   scoped_ptr<PlatformEventSource> platform_event_source_;
   scoped_ptr<CursorFactoryOzone> cursor_factory_ozone_;
   scoped_ptr<InputController> input_controller_;
   scoped_ptr<GpuPlatformSupport> gpu_platform_support_;
   scoped_ptr<GpuPlatformSupportHost> gpu_platform_support_host_;
   base::FilePath file_path_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformTest);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformTest() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
   base::FilePath location;
   if (cmd->HasSwitch(switches::kOzoneDumpFile))
     location = cmd->GetSwitchValuePath(switches::kOzoneDumpFile);
   return new OzonePlatformTest(location);
 }
 
 }  // namespace ui