cc: Allow sending BeginMainFrame before draw or activation

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>
 
 #if defined(OS_ANDROID)
@@ skipping 72 matching lines @@
   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_impl_frame_scheduling_enabled =
       cmd->HasSwitch(switches::kEnableBeginFrameScheduling);
+  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.using_synchronous_renderer_compositor =
       widget->UsingSynchronousRendererCompositor();
   settings.accelerated_animation_enabled =
       !cmd->HasSwitch(cc::switches::kDisableThreadedAnimation);
   settings.touch_hit_testing =
       !cmd->HasSwitch(cc::switches::kDisableCompositorTouchHitTesting);
 
   int default_tile_width = settings.default_tile_size.width();
   if (cmd->HasSwitch(switches::kDefaultTileWidth)) {
     GetSwitchValueAsInt(*cmd, switches::kDefaultTileWidth, 1,
@@ skipping 532 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content