[automerger skipped] Use index mask when there is no valid input mask from output mask. am: 3e1b3e706e -s ours

am skip reason: Merged-In Ie6b5d80899a7eeea1fcb88fcdf8cd50bc1a97321 with SHA-1 faa67ff684 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/20520697

Change-Id: I44a943450a262fc865535ee008025e6447be785f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>