gpu: Fix Mac fullscreen video

gpu/ipc/service/pass_through_image_transport_surface.cc

 // Copyright 2016 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 "gpu/ipc/service/pass_through_image_transport_surface.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
@@ skipping 124 matching lines @@
 
 void PassThroughImageTransportSurface::SetLatencyInfo(
     const std::vector<ui::LatencyInfo>& latency_info) {
   latency_info_.insert(latency_info_.end(), latency_info.begin(),
                        latency_info.end());
 }
 
 void PassThroughImageTransportSurface::SendVSyncUpdateIfAvailable() {
   gfx::VSyncProvider* vsync_provider = GetVSyncProvider();
   if (vsync_provider) {
-    // PassThroughImageTransportSurface owns the VSyncProvider and will
-    // outlive it. Thus, base::Unretained is safe here.
     vsync_provider->GetVSyncParameters(base::Bind(
         &ImageTransportSurfaceDelegate::UpdateVSyncParameters, delegate_));
   }
 }
 
 std::unique_ptr<std::vector<ui::LatencyInfo>>
 PassThroughImageTransportSurface::StartSwapBuffers() {
   // GetVsyncValues before SwapBuffers to work around Mali driver bug:
   // crbug.com/223558.
   SendVSyncUpdateIfAvailable();
@@ skipping 31 matching lines @@
 
 void PassThroughImageTransportSurface::FinishSwapBuffersAsync(
     std::unique_ptr<std::vector<ui::LatencyInfo>> latency_info,
     GLSurface::SwapCompletionCallback callback,
     gfx::SwapResult result) {
   FinishSwapBuffers(std::move(latency_info), result);
   callback.Run(result);
 }
 
 }  // namespace gpu