Track input latency with UMA stats

ash/wm/custom_frame_view_ash_unittest.cc

Index: ash/wm/custom_frame_view_ash_unittest.cc
diff --git a/ash/wm/custom_frame_view_ash_unittest.cc b/ash/wm/custom_frame_view_ash_unittest.cc
index 5900ae593cba342707e504784386b29b74171eec..f81d2995967182849a743fe3ee7e3949da9e243f 100644
--- a/ash/wm/custom_frame_view_ash_unittest.cc
+++ b/ash/wm/custom_frame_view_ash_unittest.cc
@@ -18,6 +18,7 @@
 #include "ui/aura/test/event_generator.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
+#include "ui/base/events/event_utils.h"
 #include "ui/base/gestures/gesture_configuration.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/test/test_views_delegate.h"
@@ -474,13 +475,17 @@ TEST_F(CustomFrameViewAshTest, MaximizeTap) {
   ui::GestureConfiguration::set_default_radius(0);
 
   const int kTouchId = 2;
-  ui::TouchEvent press(ui::ET_TOUCH_PRESSED, button_pos, kTouchId,
-      base::Time::NowFromSystemTime() - base::Time());
+  ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
+                       button_pos,
+                       kTouchId,
+                       ui::EventTimeForNow());
   root_window->AsRootWindowHostDelegate()->OnHostTouchEvent(&press);
 
   button_pos.Offset(9, 8);
   ui::TouchEvent release(
-      ui::ET_TOUCH_RELEASED, button_pos, kTouchId,
+      ui::ET_TOUCH_RELEASED,
+      button_pos,
+      kTouchId,
       press.time_stamp() + base::TimeDelta::FromMilliseconds(50));
   root_window->AsRootWindowHostDelegate()->OnHostTouchEvent(&release);