Re-enable Eager Gesture Recognition on Aura

ui/events/gesture_detection/gesture_event_data_packet.h

Index: ui/events/gesture_detection/gesture_event_data_packet.h
diff --git a/ui/events/gesture_detection/gesture_event_data_packet.h b/ui/events/gesture_detection/gesture_event_data_packet.h
index 9b115de9ca77b29c2210b4933cd9a78acbb69198..bfdd688abe033f4cb236a821add8b5213d7b559e 100644
--- a/ui/events/gesture_detection/gesture_event_data_packet.h
+++ b/ui/events/gesture_detection/gesture_event_data_packet.h
@@ -29,6 +29,12 @@ class GESTURE_DETECTION_EXPORT GestureEventDataPacket {
     TOUCH_TIMEOUT,         // Timeout from an existing gesture sequence.
   };
 
+  enum class AckState : int {
+    PENDING,
+    CONSUMED,
+    UNCONSUMED,
+  };
+
   GestureEventDataPacket();
   GestureEventDataPacket(const GestureEventDataPacket& other);
   ~GestureEventDataPacket();
@@ -48,6 +54,11 @@ class GESTURE_DETECTION_EXPORT GestureEventDataPacket {
   const gfx::PointF& touch_location() const { return touch_location_; }
   const gfx::PointF& raw_touch_location() const { return raw_touch_location_; }
 
+  // If we receive an ack for a packet before it reaches the head of the
+  // queue, we store the ack with the packet.
+  void ack(bool event_consumed);

[jdduke (slow), 2014/11/26 16:07:09]

Nit: Uppercase. Also, the comment is a little unclear, as we also store the ack
with the packet for the async case.

[tdresser, 2014/11/27 18:26:24]

Done.

+  AckState ack_state() { return ack_state_; }
+
  private:
   GestureEventDataPacket(base::TimeTicks timestamp,
                          GestureSource source,
@@ -60,6 +71,7 @@ class GESTURE_DETECTION_EXPORT GestureEventDataPacket {
   gfx::PointF touch_location_;
   gfx::PointF raw_touch_location_;
   GestureSource gesture_source_;
+  AckState ack_state_;
 };
 
 }  // namespace ui