ozone: Add post message loop initialization hook

ui/ozone/demo/ozone_demo.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 181 matching lines @@
 
 RendererFactory::RendererFactory() : type_(SOFTWARE) {
 }
 
 RendererFactory::~RendererFactory() {
 }
 
 bool RendererFactory::Initialize() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (!command_line->HasSwitch(kDisableGpu) &&
-      gfx::GLSurface::InitializeOneOff() &&
-      gpu_helper_.Initialize(base::ThreadTaskRunnerHandle::Get(),
-                             base::ThreadTaskRunnerHandle::Get())) {
-    if (command_line->HasSwitch(switches::kOzoneUseSurfaceless)) {
-      type_ = SURFACELESS_GL;
-    } else {
-      type_ = GL;
+      gfx::GLSurface::InitializeOneOff()) {
+    ui::OzonePlatform::InitializeForGPUPostMainLoop();
+    if (gpu_helper_.Initialize(base::ThreadTaskRunnerHandle::Get(),
+                               base::ThreadTaskRunnerHandle::Get())) {
+      if (command_line->HasSwitch(switches::kOzoneUseSurfaceless)) {
+        type_ = SURFACELESS_GL;
+      } else {
+        type_ = GL;
+      }
     }
   } else {
     type_ = SOFTWARE;
   }
 
   return true;
 }
 
 scoped_ptr<ui::Renderer> RendererFactory::CreateRenderer(
     gfx::AcceleratedWidget widget,
@@ skipping 120 matching lines @@
       ->SetCurrentLayoutByName("us");
 
   base::RunLoop run_loop;
 
   WindowManager window_manager(run_loop.QuitClosure());
 
   run_loop.Run();
 
   return 0;
 }