Plumbing input event latency reporting through Mus GPU.

services/ui/surfaces/display_output_surface.h

Index: services/ui/surfaces/display_output_surface.h
diff --git a/services/ui/surfaces/display_output_surface.h b/services/ui/surfaces/display_output_surface.h
index 0861c1d7bbe1a3baaa2bd52965f7df687b4a500e..79c15b9e9fb1153b62400b7aecdc11569b9c490d 100644
--- a/services/ui/surfaces/display_output_surface.h
+++ b/services/ui/surfaces/display_output_surface.h
@@ -9,6 +9,7 @@
 
 #include "cc/output/in_process_context_provider.h"
 #include "cc/output/output_surface.h"
+#include "ui/latency/latency_tracker.h"
 
 namespace cc {
 class SyntheticBeginFrameSource;
@@ -54,7 +55,7 @@ class DisplayOutputSurface : public cc::OutputSurface {
  private:
   // Called when a swap completion is signaled from ImageTransportSurface.
   void OnGpuSwapBuffersCompleted(
-      const std::vector<ui::LatencyInfo>& latency_info,
+      const std::vector<LatencyInfo>& latency_info,
       gfx::SwapResult result,
       const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac);
   void OnVSyncParametersUpdated(base::TimeTicks timebase,
@@ -62,6 +63,8 @@ class DisplayOutputSurface : public cc::OutputSurface {
 
   cc::OutputSurfaceClient* client_ = nullptr;
   cc::SyntheticBeginFrameSource* const synthetic_begin_frame_source_;
+  LatencyTracker latency_tracker_;
+
   bool set_draw_rectangle_for_frame_ = false;
   // True if the draw rectangle has been set at all since the last resize.
   bool has_set_draw_rectangle_since_last_resize_ = false;