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Touch-events targetted to the root-window can be handled. This can happen
when, for example, an event handler is installed on the Env, or the RootWindow,
which takes some action based on the touch event.

BUG=chrome-os-partner:17053

Review URL: https://codereview.chromium.org/11833007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175882 0039d316-1c4b-4281-b951-d872f2087c98