base

Add the hidden ACTION_GET_MULTIPLE_PHONES and EXTRA_PHONE_URIS:
a. Add the ACTION_GET_MULTIPLE_PHONES which will launch the contacts with multiple picker mode, and user can selected the multiple phones in the list of phone numbers.
b. Add the EXTRA_PHONE_URIS which works with ACTION_PICK_MULTIPLE to specify the phone numbers should be selected by default when it is used as input or store the list of selected phone numbers when returnning from the activity.

Change-Id: Icacae0ab9fc0f5e90aa28796fac55528df5324d5