Merge "Make the dropbox rate limiter behave stricter." into udc-dev am: 3cecf1aa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21508505



Change-Id: Ic39895b3f8a336cfac148e2d03674672200e27f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>