ozone: Add post message loop initialization hook

ui/ozone/public/ozone_platform.h

Index: ui/ozone/public/ozone_platform.h
diff --git a/ui/ozone/public/ozone_platform.h b/ui/ozone/public/ozone_platform.h
index d27709a94890b9979c9b14eb3fe4e4ddf3641de5..e833cd65f95e3a86c230fc3748322dfd45474b82 100644
--- a/ui/ozone/public/ozone_platform.h
+++ b/ui/ozone/public/ozone_platform.h
@@ -50,6 +50,12 @@ class OZONE_EXPORT OzonePlatform {
   // 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
@@ -70,6 +76,7 @@ class OZONE_EXPORT OzonePlatform {
  private:
   virtual void InitializeUI() = 0;
   virtual void InitializeGPU() = 0;
+  virtual void InitializeGPUPostMainLoop() = 0;

[spang, 2015/03/31 20:58:49]

Can you capitalize it as 'Gpu'. We could change the other one as well.

There's a lot more of the 'Gpu' style than 'GPU' in the codebase and it is
easier to read. I think we should standardize on that.

[vignatti (out of this project), 2015/04/01 16:26:11]

Done.

 
   static void CreateInstance();