vpxdec: handle non-display frames

Bug: 143115066
Test: bug repro steps
Merged-In: I4c581b229b83a555d6214075f0e5367d17461cc9
Change-Id: I4c581b229b83a555d6214075f0e5367d17461cc9
(cherry picked from commit 377eeab0007ccde21bf8839529be82c2a7c48fea)
2 files changed