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When accounts are shared to a restricted/limited user, apps can opt-in to viewing accounts of a certain type. Other shared accounts are not visible to the app. App would specify the account type in the manifest <application> tag with the attribute restrictedAccountType="foo.bar", where "foo.bar" is the account type as defined by the authenticator. Change-Id: I7586da04d6d6d32aae15adc6b1366f325bb07384