Track graphic buffer mode in OMXNodeInstance

Test: cts-tradefed run cts -p android.media & YT & Play Movies & Cast
Bug: 62948670
Merged-In: Icbd9b767f1aef005819e680f77f4a05041988f34
Change-Id: Icbd9b767f1aef005819e680f77f4a05041988f34
2 files changed