[automerger skipped] Merge "Add FrameDropper_test to mts" into mainline-prod...

[automerger skipped] Merge "Add FrameDropper_test to mts" into mainline-prod am: 1d7a9057 -s ours am: d6aebd02 -s ours

am skip reason: Change-Id I9b41fc700cf76c6a6a789b5beabe4f93dd82ce8b with SHA-1 2f18164f is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/13618505

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4dc0beca339c477fa4a8660f23cedf5c0b1ca42d