Cache dropped callbacks in STInstrumentation am: d20f8d50 am: 4c9027f0 am: e0cca8ba am: 9f8c7151

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22916170



Change-Id: I252163ff5e264c23959b8f48a2486dce199ba932
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>