Use LatencyInfoSwapPromise to track LatencyInfo through compositor

ui/compositor/compositor.cc

 // Copyright (c) 2012 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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
+#include "cc/base/latency_info_swap_promise.h"
 #include "cc/base/switches.h"
 #include "cc/input/input_handler.h"
 #include "cc/layers/layer.h"
 #include "cc/output/context_provider.h"
 #include "cc/trees/layer_tree_host.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer.h"
@@ skipping 400 matching lines @@
 
 void Compositor::ScheduleFullRedraw() {
   host_->SetNeedsRedraw();
 }
 
 void Compositor::ScheduleRedrawRect(const gfx::Rect& damage_rect) {
   host_->SetNeedsRedrawRect(damage_rect);
 }
 
 void Compositor::SetLatencyInfo(const ui::LatencyInfo& latency_info) {
-  host_->SetLatencyInfo(latency_info);
+  scoped_ptr<cc::SwapPromise> swap_promise(
+      new cc::LatencyInfoSwapPromise(latency_info));
+  host_->QueueSwapPromise(swap_promise.Pass());
 }
 
 bool Compositor::ReadPixels(SkBitmap* bitmap,
                             const gfx::Rect& bounds_in_pixel) {
   if (bounds_in_pixel.right() > size().width() ||
       bounds_in_pixel.bottom() > size().height())
     return false;
   bitmap->setConfig(SkBitmap::kARGB_8888_Config,
                     bounds_in_pixel.width(), bounds_in_pixel.height());
   bitmap->allocPixels();
@@ skipping 165 matching lines @@
     // CompositorObservers to be notified before starting another
     // draw cycle.
     ScheduleDraw();
   }
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingEnded(this));
 }
 
 }  // namespace ui