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This adds an explicit "platform" option to repack_locales.py, so
resources for one platform (e.g. Android) can be compiled on another
(e.g. Linux).

BUG=136951


Review URL: https://chromiumcodereview.appspot.com/10830085

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149488 0039d316-1c4b-4281-b951-d872f2087c98