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)
2 files changed