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It is possible that a window starts doing synchronous touch-event handling
after doing asynchronous handling for some time. As a result, these sync
events may be processed before the acks for the queued asynchronous events
have been processed. This results in unexpected behaviour. So in such cases,
queue up the synchronous events so that they get processed only after the
asynchronous events are processed.

BUG=139339, 134486

Review URL: https://chromiumcodereview.appspot.com/10825323

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151361 0039d316-1c4b-4281-b951-d872f2087c98