[DevTools] Interactive test for DevTools touch emulation.

ui/events/gesture_detection/gesture_provider.cc

Index: ui/events/gesture_detection/gesture_provider.cc
diff --git a/ui/events/gesture_detection/gesture_provider.cc b/ui/events/gesture_detection/gesture_provider.cc
index 84fb854aec78d5669059458c118a6033579ba76b..d492215f542bb4b8942d6a05dcd165743faed2af 100644
--- a/ui/events/gesture_detection/gesture_provider.cc
+++ b/ui/events/gesture_detection/gesture_provider.cc
@@ -522,6 +522,7 @@ bool GestureProvider::OnTouchEvent(const MotionEvent& event) {
                "action", GetMotionEventActionName(event.GetAction()));
 
   DCHECK_NE(0u, event.GetPointerCount());
+  DCHECK(event.GetEventTime() != base::TimeTicks());

[jdduke (slow), 2014/04/24 14:52:39]

Of course, yeah |DCHECK(!event.GetEventTime().is_null())| is probably better
here.

 
   if (!CanHandle(event))
     return false;