If WebCore doesn't response touch down in time, don't
block the UI tap, pan and double tap. Added a time out
(which is same as shortpress time out, 200ms) for how
long we wait for WebCore's response for touch down.

This should fix the problem where pan/touch is not working
all the time when Flash plugin is installed.

Fix http://b/issue?id=2144761
1 file changed