Fix NPE when requesting outsets for detached view.
Fix NPE when requesting outsets for detached view.

Outsets are used during measure/layout pass, but this can be called on a
view that is not currently attached.

Bug: 21602590
Change-Id: I23e3acc45ca4bf7684d8913f839e29e8e9e94d78
(cherry picked from commit e660d4e96a2e5ac35f2dd6e2b43c588dd7e28358)

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base