Promotion of android_ui.lnx.1.2-00004.

CRs      Change ID                                   Subject
--------------------------------------------------------------------------------------------------------------
982803   I8816707a8340ffddf1900209b503029aa6683738   Gallery2: fix ConcurrentModificationException in MediaSe
979189   I3ee9f88edc5a957b66a255478028cbdbfe4c391d   Gallery2: Fix null pointer exception when select "Exposu
979743   Ic0caed197bc0392eb2b8df357bfa120da8f09e16   Gallery2: fix function of back button in top left corner
979832   I45f42389649dfd63a7e53503a0c89dc635fb275d   Gallery2: fix display abnormal of the done button.

Change-Id: I0a71703bceebb24b87d211251668f1515c24b418
CRs-Fixed: 979189, 982803, 979832, 979743