ozone: Add post message loop initialization hook

ui/ozone/public/ozone_platform.h

 // 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.
 
 #ifndef UI_OZONE_PUBLIC_OZONE_PLATFORM_H_
 #define UI_OZONE_PUBLIC_OZONE_PLATFORM_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/ozone/ozone_export.h"
 
@@ skipping 32 matching lines @@
   OzonePlatform();
   virtual ~OzonePlatform();
 
   // Initializes the subsystems/resources necessary for the UI process (e.g.
   // events, surface, etc.)
   static void InitializeForUI();
 
   // Initializes the subsystems/resources necessary for the GPU process.
   static void InitializeForGPU();
 
+  // Initializes the subsystems/resources necessary for the GPU process, after
+  // the message loop is started. This is used mainly for initialization tasks
+  // that need to take a reference to the UI thread MessageLoopProxy.
+  // InitializeForGPU() necessarily needs to be called first.
+  static void InitializeForGpuPostMainLoop();
+
   static OzonePlatform* GetInstance();
 
   // Factory getters to override in subclasses. The returned objects will be
   // injected into the appropriate layer at startup. Subclasses should not
   // inject these objects themselves. Ownership is retained by OzonePlatform.
   virtual ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() = 0;
   virtual ui::CursorFactoryOzone* GetCursorFactoryOzone() = 0;
   virtual ui::InputController* GetInputController() = 0;
   virtual ui::GpuPlatformSupport* GetGpuPlatformSupport() = 0;
   virtual ui::GpuPlatformSupportHost* GetGpuPlatformSupportHost() = 0;
   virtual scoped_ptr<SystemInputInjector> CreateSystemInputInjector() = 0;
   virtual scoped_ptr<PlatformWindow> CreatePlatformWindow(
       PlatformWindowDelegate* delegate,
       const gfx::Rect& bounds) = 0;
   virtual scoped_ptr<ui::NativeDisplayDelegate>
       CreateNativeDisplayDelegate() = 0;
 
  private:
   virtual void InitializeUI() = 0;
   virtual void InitializeGPU() = 0;
+  virtual void InitializeGpuPostMainLoop() = 0;
 
   static void CreateInstance();
 
   static OzonePlatform* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatform);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_OZONE_PLATFORM_H_