Merge "MediaMetrics: Tune garbage collection" into rvc-dev am: d25de3abde am: 76a4b3e60c am: 15d2b14f33

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/11931278

Change-Id: I8f779c2c493fc01720371ca227052e45b6f2fa62