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

ui/chromeos/touch_exploration_controller.cc

Index: ui/chromeos/touch_exploration_controller.cc
diff --git a/ui/chromeos/touch_exploration_controller.cc b/ui/chromeos/touch_exploration_controller.cc
index d4399b1eb45969144fce501748b6a6d8eeca3d21..a273ab8e9bac87a3fcc8c219045ba9b2bf5bcdb3 100644
--- a/ui/chromeos/touch_exploration_controller.cc
+++ b/ui/chromeos/touch_exploration_controller.cc
@@ -688,12 +688,11 @@ ui::EventRewriteStatus TouchExplorationController::InTwoFingerTap(
   return ui::EVENT_REWRITE_DISCARD;
 }
 
-base::TimeDelta TouchExplorationController::Now() {
+base::TimeTicks TouchExplorationController::Now() {
   if (tick_clock_) {
     // This is the same as what EventTimeForNow() does, but here we do it
     // with a clock that can be replaced with a simulated clock for tests.
-    return base::TimeDelta::FromInternalValue(
-        tick_clock_->NowTicks().ToInternalValue());
+    return tick_clock_->NowTicks();
   }
   return ui::EventTimeForNow();
 }
@@ -1019,9 +1018,8 @@ TouchExplorationController::CreateMouseMoveEvent(const gfx::PointF& location,
   // event to the new ChromeVox background page via the automation api.
   flags |= ui::EF_COMMAND_DOWN;
 
-  std::unique_ptr<ui::MouseEvent> event(
-      new ui::MouseEvent(ui::ET_MOUSE_MOVED, gfx::Point(), gfx::Point(),
-                         ui::EventTimeForNow(), flags, 0));
+  std::unique_ptr<ui::MouseEvent> event(new ui::MouseEvent(
+      ui::ET_MOUSE_MOVED, gfx::Point(), gfx::Point(), Now(), flags, 0));
   event->set_location_f(location);
   event->set_root_location_f(location);
   return event;