Added support for Android and iOS to the grit policy generators.

BUG=275292
R=pastarmovj@chromium.org

Review URL: https://codereview.chromium.org/140783003

git-svn-id: http://grit-i18n.googlecode.com/svn/trunk@147 7262f16d-afe8-6277-6482-052fa10e57b1