Use LatencyInfoSwapPromise to track LatencyInfo through compositor

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 89c9805e4d9ce7bdc6aabc437218ca436c42acf9..32666e0424e744165e7717929f2c6c484b97ef92 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -37,7 +37,6 @@
 #include "cc/trees/occlusion_tracker.h"
 #include "cc/trees/proxy.h"
 #include "third_party/skia/include/core/SkColor.h"
-#include "ui/events/latency_info.h"
 #include "ui/gfx/rect.h"
 
 namespace cc {
@@ -233,7 +232,6 @@ class CC_EXPORT LayerTreeHost {
   void ApplyScrollAndScale(const ScrollAndScaleSet& info);
 
   void SetImplTransform(const gfx::Transform& transform);
-  void SetLatencyInfo(const ui::LatencyInfo& latency_info);
 
   // Virtual for tests.
   virtual void StartRateLimiter();
@@ -417,8 +415,6 @@ class CC_EXPORT LayerTreeHost {
 
   bool in_paint_layer_contents_;
 
-  ui::LatencyInfo latency_info_;
-
   static const int kTotalFramesToUseForLCDTextMetrics = 50;
   int total_frames_used_for_lcd_text_metrics_;