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)