Ozone: Avoid blocking in Swapbuffer Call.

ui/ozone/platform/dri/gbm_surface_factory.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/dri/gbm_surface_factory.h"
 
 #include <gbm.h>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "third_party/khronos/EGL/egl.h"
 #include "ui/ozone/common/egl_util.h"
 #include "ui/ozone/platform/dri/dri_window_delegate_impl.h"
 #include "ui/ozone/platform/dri/dri_window_delegate_manager.h"
 #include "ui/ozone/platform/dri/gbm_buffer.h"
 #include "ui/ozone/platform/dri/gbm_surface.h"
 #include "ui/ozone/platform/dri/gbm_surfaceless.h"
+#include "ui/ozone/platform/dri/page_flip_event_handler.h"
 #include "ui/ozone/platform/dri/screen_manager.h"
 #include "ui/ozone/public/native_pixmap.h"
 #include "ui/ozone/public/overlay_candidates_ozone.h"
 #include "ui/ozone/public/ozone_switches.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
 namespace ui {
 namespace {
 
 class SingleOverlay : public OverlayCandidatesOzone {
@@ skipping 93 matching lines @@
 
   return surface.Pass();
 }
 
 scoped_ptr<SurfaceOzoneEGL>
 GbmSurfaceFactory::CreateSurfacelessEGLSurfaceForWidget(
     gfx::AcceleratedWidget widget) {
   if (!allow_surfaceless_)
     return scoped_ptr<SurfaceOzoneEGL>();
 
+  if (!flip_handler_)
+    flip_handler_ =
+        scoped_ptr<PageFlipEventHandler>(new PageFlipEventHandler());
+
   DriWindowDelegate* delegate = GetOrCreateWindowDelegate(widget);
-  return scoped_ptr<SurfaceOzoneEGL>(new GbmSurfaceless(delegate));
+  return scoped_ptr<SurfaceOzoneEGL>(
+      new GbmSurfaceless(delegate, flip_handler_.get()));
 }
 
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
     BufferFormat format,
     BufferUsage usage) {
   if (usage == MAP)
     return NULL;
 
@@ skipping 63 matching lines @@
     scoped_ptr<DriWindowDelegate> delegate(new DriWindowDelegateImpl(
         widget, drm_, window_manager_, screen_manager_));
     delegate->Initialize();
     window_manager_->AddWindowDelegate(widget, delegate.Pass());
   }
 
   return window_manager_->GetWindowDelegate(widget);
 }
 
 }  // namespace ui