[flexiglass] Bouncer throttling - composables. am: 33ddd9ab am: 690c782e am: e84f9e3e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23303130



Change-Id: Ib11d8c80bd15da59af2d6c7648584e3fcc69bf6b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>