DO NOT MERGE: drm_hwcomposer: Introduce Planner interface am: d9c3e2d9c8  -s ours am: 4258a8a169
am: 3fd4ebedc7  -s ours

* commit '3fd4ebedc713d3bc6ca86b3530e35304fd7c7539':

Change-Id: I507f95bbaca12ce35e0591782aebd920a39cfe0f