cc: Implement unified BeginFrame on aura

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 158 matching lines @@
   CommandLine* cmd = CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
 
   // For web contents, layer transforms should scale up the contents of layers
   // to keep content always crisp when possible.
   settings.layer_transforms_should_scale_layer_contents = true;
 
   settings.throttle_frame_production =
       !cmd->HasSwitch(switches::kDisableGpuVsync);
-  settings.use_external_begin_frame_source =
-      cmd->HasSwitch(switches::kEnableBeginFrameScheduling);
+#if defined(USE_AURA)
+  settings.use_external_begin_frame_source = true;
+#endif
   settings.main_frame_before_activation_enabled =
       cmd->HasSwitch(cc::switches::kEnableMainFrameBeforeActivation) &&
       !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeActivation);
   settings.report_overscroll_only_for_scrollable_axes = true;
   settings.accelerated_animation_enabled =
       !cmd->HasSwitch(cc::switches::kDisableThreadedAnimation);
   settings.use_display_lists = cmd->HasSwitch(switches::kEnableSlimmingPaint);
 
   settings.default_tile_size = CalculateDefaultTileSize();
   if (cmd->HasSwitch(switches::kDefaultTileWidth)) {
@@ skipping 700 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content