Unified BeginFrame scheduling

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 151 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.begin_frame_scheduling_enabled =
-      cmd->HasSwitch(switches::kEnableBeginFrameScheduling);
+#if defined(OS_ANDROID) || (defined(USE_AURA) &&!defined(OS_CHROMEOS))

[brianderson, 2014/09/04 18:45:46]

Why !OS_CHROMEOS?
For platforms other than Mac, can we always set settings.begin_frame_receiver to
true in the Renderer?

+  settings.begin_frame_receiver = true;
+#elif defined(OS_MACOSX)
+  // Mac only uses browser compositor when delegated renderer is used.
+  if (cmd->HasSwitch(switches::kEnableDelegatedRenderer))
+    settings.begin_frame_receiver = true;
+#endif
   settings.main_frame_before_activation_enabled =
       cmd->HasSwitch(cc::switches::kEnableMainFrameBeforeActivation) &&
       !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeActivation);
   settings.main_frame_before_draw_enabled =
       !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeDraw);
   settings.report_overscroll_only_for_scrollable_axes = true;
   settings.accelerated_animation_enabled =
       !cmd->HasSwitch(cc::switches::kDisableThreadedAnimation);
 
   settings.default_tile_size = CalculateDefaultTileSize();
@@ skipping 615 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content