Add app_missed_frames to CUJ metric am: 8fad65ab31 am: e4a5a3e2e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/platform_testing/+/16273625

Change-Id: I45699d71f0b16039f11eb7a74d57e31b9ca45dd7
tree: 198d96a8b703ce8dd676af1a57bf9680423fdd14
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg