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Gesture and Touch events are now passed into the content window. 
This is only enabled if --enable-touch-events is flagged on the command line.

BUG=124938
TEST=


Review URL: https://chromiumcodereview.appspot.com/10365009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137920 0039d316-1c4b-4281-b951-d872f2087c98