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Currently we are just coalescing scrollUpdates and we end up not utilizing
this when we have interleaved scrollUpdate and pinchUpdates. This change makes
that possible and makes sure the gesture_event_queue doesnt get flooded with
interleaved scroll and pinch updates.

BUG=174189


Review URL: https://chromiumcodereview.appspot.com/12225056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182205 0039d316-1c4b-4281-b951-d872f2087c98