Track graphic buffer mode in OMXNodeInstance Test: CtsMediaTestCases & YT & Play Movies & Cast Bug: 62948670 Merged-In: Icbd9b767f1aef005819e680f77f4a05041988f34 Change-Id: Icbd9b767f1aef005819e680f77f4a05041988f34 (cherry picked from commit cb8c0cbe5625c709103c1e97581c809e72f5b1da)