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This is necessary to support the generation of the correct dblclick event sequence in WebKit.

Remove evil generic_x/generic_y from GestureEventDetails (some event types have data other than floats in that position of the union, this wasn't typesafe).

Adds missing double tap gesture recognizer unit tests.

This makes ET_GESTURE_DOUBLE_TAP pretty pointless now.  I've filed crbug.com/140382 to track removing it.

BUG=115486


Review URL: https://chromiumcodereview.appspot.com/10824158

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149935 0039d316-1c4b-4281-b951-d872f2087c98