Add LayerTreeHostSettings for synchronous compositor

cc/trees/thread_proxy.cc

 // Copyright 2011 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 "cc/trees/thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/base/thread.h"
@@ skipping 44 matching lines @@
       begin_frame_completion_event_on_impl_thread_(NULL),
       readback_request_on_impl_thread_(NULL),
       commit_completion_event_on_impl_thread_(NULL),
       completion_event_for_commit_held_on_tree_activation_(NULL),
       texture_acquisition_completion_event_on_impl_thread_(NULL),
       next_frame_is_newly_committed_frame_on_impl_thread_(false),
       render_vsync_enabled_(layer_tree_host->settings().render_vsync_enabled),
       render_vsync_notification_enabled_(
           layer_tree_host->settings().render_vsync_notification_enabled),
       vsync_client_(NULL),
+      enable_synchronous_compositing_(
+          layer_tree_host->settings().enable_synchronous_compositing),
       inside_draw_(false),
       defer_commits_(false),
       renew_tree_priority_on_impl_thread_pending_(false) {
   TRACE_EVENT0("cc", "ThreadProxy::ThreadProxy");
   DCHECK(IsMainThread());
   DCHECK(layer_tree_host_);
 }
 
 ThreadProxy::~ThreadProxy() {
   TRACE_EVENT0("cc", "ThreadProxy::~ThreadProxy");
@@ skipping 1032 matching lines @@
   DCHECK(IsImplThread());
   layer_tree_host_impl_ = layer_tree_host_->CreateLayerTreeHostImpl(this);
   const base::TimeDelta display_refresh_interval =
       base::TimeDelta::FromMicroseconds(
           base::Time::kMicrosecondsPerSecond /
           layer_tree_host_->settings().refresh_rate);
   scoped_ptr<FrameRateController> frame_rate_controller;
   if (render_vsync_enabled_) {
     if (render_vsync_notification_enabled_) {
       frame_rate_controller.reset(
-          new FrameRateController(VSyncTimeSource::Create(this)));
+          new FrameRateController(VSyncTimeSource::Create(
+              this,
+              enable_synchronous_compositing_ ?
+                  VSyncTimeSource::DISABLE_SYNCHRONOUSLY :
+                  VSyncTimeSource::DISABLE_ON_NEXT_TICK)));
     } else {
       frame_rate_controller.reset(
           new FrameRateController(DelayBasedTimeSource::Create(
               display_refresh_interval, Proxy::ImplThread())));
     }
   } else {
     frame_rate_controller.reset(new FrameRateController(Proxy::ImplThread()));
   }
   const LayerTreeSettings& settings = layer_tree_host_->settings();
   SchedulerSettings scheduler_settings;
@@ skipping 239 matching lines @@
 
 void ThreadProxy::DidReceiveLastInputEventForVSync(
     base::TimeTicks frame_time) {
   if (render_vsync_notification_enabled_) {
     TRACE_EVENT0("cc", "ThreadProxy::DidReceiveLastInputEventForVSync");
     DidVSync(frame_time);
   }
 }
 
 }  // namespace cc