If a gesture cannot be detected the device should transition to touch exploration state.

1. We are deciding whether the user is performing a gesture or an exploration based
   on the gesture velocity. If we are detecting gesture we do the recognition at the
   gesture end which is when the finger goes up. This is better than having a mode
   toggle gesture for exploring and gestures detection. However, it is possible that
   the user really wanted to perform an exploration but was moving too fast and
   unless he lifts his finger the device is in gesture detection mode. This is
   frustrating since the user has no feedback and assumes exploration does not
   work.

   We want to perform gesture detection only for a maximal time frame and if the
   user did not lift his finger we transition into touch exploration state.

bug:6663173

Change-Id: I954ff937cca902e31b51325d1e1dfce84d239624