ozone: Add post message loop initialization hook

ui/ozone/platform/egltest/ozone_platform_egltest.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 "ui/ozone/platform/egltest/ozone_platform_egltest.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
@@ skipping 360 matching lines @@
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
   }
 
   void InitializeGPU() override {
     if (!surface_factory_ozone_)
       surface_factory_ozone_.reset(
           new SurfaceFactoryEgltest(&eglplatform_shim_));
     gpu_platform_support_.reset(CreateStubGpuPlatformSupport());
   }
 
+  void InitializeGpuPostMainLoop() override {}
+
  private:
   LibeglplatformShimLoader eglplatform_shim_;
   scoped_ptr<DeviceManager> device_manager_;
   scoped_ptr<SurfaceFactoryEgltest> surface_factory_ozone_;
   scoped_ptr<EventFactoryEvdev> event_factory_ozone_;
   scoped_ptr<CursorFactoryOzone> cursor_factory_ozone_;
   scoped_ptr<GpuPlatformSupport> gpu_platform_support_;
   scoped_ptr<GpuPlatformSupportHost> gpu_platform_support_host_;
 
   bool shim_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformEgltest);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformEgltest() {
   OzonePlatformEgltest* platform = new OzonePlatformEgltest;
   platform->Initialize();
   return platform;
 }
 
 }  // namespace ui