Track graphic buffer mode in OMXNodeInstance

Test: CtsMediaTestCases & YT & Play Movies & Cast
Bug: 62948670
Merged-In: Icbd9b767f1aef005819e680f77f4a05041988f34
Change-Id: Icbd9b767f1aef005819e680f77f4a05041988f34
(cherry picked from commit f630233ee42214b36e6862dc99114f2c2bdda018)
2 files changed