Accessibility: Handle a missed case when clicking focused views.

The special logic for clicking on views in accessibility mode should not
prevent event interception and if a view interceptes the gesture we must
clear the special flag and do normal event dispatch. Also once we have a
view handling the touch gesture we do not need the special flag as we
know what will handle the event. This tightly follows standard event
dispatching.

bug:19252492

Change-Id: I0c9764c5050ec73f5f7980f3f0340dd9509a725a