Change ui::Event::time_stamp from TimeDelta to TimeTicks

ui/events/event_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/event_utils.h"
 
 #include <vector>
 
 #include "base/metrics/histogram.h"
 #include "ui/display/display.h"
@@ skipping 43 matching lines @@
     default:
       break;
   }
   return event;
 }
 
 int RegisterCustomEventType() {
   return ++g_custom_event_types;
 }
 
-base::TimeDelta EventTimeForNow() {
-  return base::TimeDelta::FromInternalValue(
-      base::TimeTicks::Now().ToInternalValue());
+base::TimeTicks EventTimeForNow() {
+  return base::TimeTicks::Now();
 }
 
 bool ShouldDefaultToNaturalScroll() {
   return GetInternalDisplayTouchSupport() ==
          display::Display::TOUCH_SUPPORT_AVAILABLE;
 }
 
 display::Display::TouchSupport GetInternalDisplayTouchSupport() {
   display::Screen* screen = display::Screen::GetScreen();
   // No screen in some unit tests.
   if (!screen)
     return display::Display::TOUCH_SUPPORT_UNKNOWN;
   const std::vector<display::Display>& displays = screen->GetAllDisplays();
   for (std::vector<display::Display>::const_iterator it = displays.begin();
        it != displays.end(); ++it) {
     if (it->IsInternal())
       return it->touch_support();
   }
   return display::Display::TOUCH_SUPPORT_UNAVAILABLE;
 }
 
 void ComputeEventLatencyOS(const base::NativeEvent& native_event) {
-  base::TimeDelta current_time = EventTimeForNow();
-  base::TimeDelta time_stamp = EventTimeFromNative(native_event);
+  base::TimeTicks current_time = EventTimeForNow();
+  base::TimeTicks time_stamp = EventTimeFromNative(native_event);
   base::TimeDelta delta = current_time - time_stamp;
 
   EventType type = EventTypeFromNative(native_event);
   switch (type) {
     case ET_MOUSEWHEEL:
       UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.MOUSE_WHEEL",
                                   delta.InMicroseconds(), 1, 1000000, 50);
       return;
     case ET_TOUCH_MOVED:
       UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_MOVED",
                                   delta.InMicroseconds(), 1, 1000000, 50);
       return;
     case ET_TOUCH_PRESSED:
       UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_PRESSED",
                                   delta.InMicroseconds(), 1, 1000000, 50);
       return;
     case ET_TOUCH_RELEASED:
       UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_RELEASED",
                                   delta.InMicroseconds(), 1, 1000000, 50);
       return;
     default:
       return;
   }
 }
 
 }  // namespace ui