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This patch adds the flags to chrome://flags to make it possible to enable it on chromebooks without tricks.

TEST=Enable the Files.app new UI feature. Check if the Files.app launches with the new ui.
BUG=226904

Review URL: https://chromiumcodereview.appspot.com/14345002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194920 0039d316-1c4b-4281-b951-d872f2087c98