Use LatencyInfoSwapPromise to track LatencyInfo through compositor

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 773fc6949298123fbb80d890c19a94e1db8d55ea..de4be79ebbc858f5e19754490fb21e07f4aad9bd 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -15,7 +15,6 @@
 #include "cc/base/swap_promise.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/resources/ui_resource_client.h"
-#include "ui/events/latency_info.h"
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
@@ -207,9 +206,7 @@ class CC_EXPORT LayerTreeImpl {
   void SetRootLayerScrollOffsetDelegate(
       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate);
 
-  void SetLatencyInfo(const ui::LatencyInfo& latency_info);
-  const ui::LatencyInfo& GetLatencyInfo();
-  void ClearLatencyInfo();
+  void TakeLatencyInfo(ui::LatencyInfo* latency_info);
 
   // Call this function when you expect there to be a swap buffer.
   // See swap_promise.h for how to use SwapPromise.
@@ -281,8 +278,6 @@ class CC_EXPORT LayerTreeImpl {
 
   bool next_activation_forces_redraw_;
 
-  ui::LatencyInfo latency_info_;
-
   ScopedPtrVector<SwapPromise> swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;