Use LatencyInfoSwapPromise to track LatencyInfo through compositor

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 917aba7c55ca827d8b35becbfeb5275e4422366b..b0b44332c1a454334ff9c3dd45c9c55a3d3fe9ce 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -17,6 +17,7 @@
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "base/values.h"
+#include "cc/base/latency_info_swap_promise.h"
 #include "cc/base/switches.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/debug/micro_benchmark.h"
@@ -391,7 +392,9 @@ void RenderWidgetCompositor::SetNeedsForcedRedraw() {
 
 void RenderWidgetCompositor::SetLatencyInfo(
     const ui::LatencyInfo& latency_info) {
-  layer_tree_host_->SetLatencyInfo(latency_info);
+  scoped_ptr<cc::SwapPromise> swap_promise(
+      new cc::LatencyInfoSwapPromise(latency_info));
+  layer_tree_host_->QueueSwapPromise(swap_promise.Pass());
 }
 
 int RenderWidgetCompositor::GetLayerTreeId() const {