[Ozone-Drm] Use synchronous page flips with the DRM platform

ui/ozone/platform/drm/gpu/drm_surface.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/drm/gpu/drm_surface.h"
 
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 52 matching lines @@
 }
 
 void DrmSurface::PresentCanvas(const gfx::Rect& damage) {
   DCHECK(base::MessageLoopForUI::IsCurrent());
 
   DCHECK(buffers_[front_buffer_ ^ 1].get());
   window_delegate_->QueueOverlayPlane(
       OverlayPlane(buffers_[front_buffer_ ^ 1]));
 
   UpdateNativeSurface(damage);
-  window_delegate_->SchedulePageFlip(false /* is_sync */,
+  window_delegate_->SchedulePageFlip(true /* is_sync */,
                                      base::Bind(&base::DoNothing));
 
   // Update our front buffer pointer.
   front_buffer_ ^= 1;
 }
 
 scoped_ptr<gfx::VSyncProvider> DrmSurface::CreateVSyncProvider() {
   return make_scoped_ptr(new DrmVSyncProvider(window_delegate_));
 }
 
 void DrmSurface::UpdateNativeSurface(const gfx::Rect& damage) {
   SkCanvas* canvas = buffers_[front_buffer_ ^ 1]->GetCanvas();
 
   // The DrmSurface is double buffered, so the current back buffer is
   // missing the previous update. Expand damage region.
   SkRect real_damage = RectToSkRect(UnionRects(damage, last_damage_));
 
   // Copy damage region.
   skia::RefPtr<SkImage> image = skia::AdoptRef(surface_->newImageSnapshot());
   canvas->drawImageRect(image.get(), &real_damage, real_damage, NULL);
 
   last_damage_ = damage;
 }
 
 }  // namespace ui