Re-enable Eager Gesture Recognition on Aura

ui/events/event.cc

Index: ui/events/event.cc
diff --git a/ui/events/event.cc b/ui/events/event.cc
index 894d5b0f2aded44d4880e4ce2d25b043c4d4477e..4a80e4bac15781ccfa98735a58829717e178b5ff 100644
--- a/ui/events/event.cc
+++ b/ui/events/event.cc
@@ -168,6 +168,10 @@ bool Event::HasNativeEvent() const {
   return !!std::memcmp(&native_event_, &null_event, sizeof(null_event));
 }
 
+void Event::DisableSynchronousHandling() {
+  result_ = static_cast<EventResult>(result_ | ER_DISABLE_SYNC_HANDLING);
+}
+
 void Event::StopPropagation() {
   // TODO(sad): Re-enable these checks once View uses dispatcher to dispatch
   // events.
@@ -512,6 +516,7 @@ void MouseWheelEvent::UpdateForRootTransform(
 TouchEvent::TouchEvent(const base::NativeEvent& native_event)
     : LocatedEvent(native_event),
       touch_id_(GetTouchId(native_event)),
+      touch_event_id_(get_next_touch_event_id()),
       radius_x_(GetTouchRadiusX(native_event)),
       radius_y_(GetTouchRadiusY(native_event)),
       rotation_angle_(GetTouchAngle(native_event)),
@@ -535,6 +540,7 @@ TouchEvent::TouchEvent(EventType type,
                        base::TimeDelta time_stamp)
     : LocatedEvent(type, location, location, time_stamp, 0),
       touch_id_(touch_id),
+      touch_event_id_(get_next_touch_event_id()),
       radius_x_(0.0f),
       radius_y_(0.0f),
       rotation_angle_(0.0f),
@@ -553,6 +559,7 @@ TouchEvent::TouchEvent(EventType type,
                        float force)
     : LocatedEvent(type, location, location, time_stamp, flags),
       touch_id_(touch_id),
+      touch_event_id_(get_next_touch_event_id()),
       radius_x_(radius_x),
       radius_y_(radius_y),
       rotation_angle_(angle),
@@ -580,6 +587,13 @@ void TouchEvent::UpdateForRootTransform(
     radius_y_ *= decomp.scale[1];
 }
 
+int TouchEvent::get_next_touch_event_id() {
+  static int id = 0;
+  // We shouldn't have many touch events in existence at a
+  // time. 100000 should give us plenty of headroom.
+  return id++ % 100000;

[tdresser, 2014/11/24 21:44:40]

This could use a SequentialIdGenerator, but that feels like it would be
overkill.

Even if we did get a duplicate ID, it wouldn't really hurt anything given the
_current_ consumers of |touch_event_id()|. What do you think?

+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // KeyEvent