ozone: Initialize a subsystem only if necessary.

ui/ozone/ozone_platform.h

 // 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.
 
 #ifndef UI_OZONE_OZONE_PLATFORM_H_
 #define UI_OZONE_OZONE_PLATFORM_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/ozone/ozone_export.h"
 
@@ skipping 20 matching lines @@
 //
 // A platform is free to use different implementations of each
 // interface depending on the context. You can, for example, create
 // different objects depending on the underlying hardware, command
 // line flags, or whatever is appropriate for the platform.
 class OZONE_EXPORT OzonePlatform {
  public:
   OzonePlatform();
   virtual ~OzonePlatform();
 
-  // Initialize the platform. Once complete, SurfaceFactoryOzone &
-  // EventFactoryOzone will be set.
-  static void Initialize();
+  // 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();
 
   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 gfx::SurfaceFactoryOzone* GetSurfaceFactoryOzone() = 0;
   virtual ui::EventFactoryOzone* GetEventFactoryOzone() = 0;
   virtual ui::InputMethodContextFactoryOzone*
       GetInputMethodContextFactoryOzone() = 0;
   virtual ui::CursorFactoryOzone* GetCursorFactoryOzone() = 0;
 #if defined(OS_CHROMEOS)
   virtual scoped_ptr<ui::NativeDisplayDelegate>
       CreateNativeDisplayDelegate() = 0;
 #endif
 
  private:
+  virtual void InitializeUI() = 0;
+  virtual void InitializeGPU() = 0;
+
+  static void CreateInstance();
+
   static OzonePlatform* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatform);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_OZONE_PLATFORM_H_