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This patch does NOT prevent tap or long press when a touch move is consumed (see
crbug.com/327444).

An additional state is added to GestureState - GS_SYNTHETIC_CLICK_ABORTED. In addition,
the meaning of GS_PENDING_SYNTHETIC_CLICK_NO_SCROLL has changed.

GS_PENDING_SYNTHETIC_CLICK_NO_SCROLL indicates that one finger is down and no scrolling
can happen, but a tap or long press can still happen.

GS_SYNTHETIC_CLICK_ABORTED indicates that a finger is down, but no gestures can be
created until the number of active touch points changes.

BUG=333947

Review URL: https://codereview.chromium.org/133273013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245635 0039d316-1c4b-4281-b951-d872f2087c98