Merge "Count the number of dropped events due to rate limiting and attach that...

Merge "Count the number of dropped events due to rate limiting and attach that number to the header of the dropbox entry." into tm-dev am: 48ecaf9d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17619726



Change-Id: I82b0cd5a062f3f7ff20b0290af6f338fea0a6ebb
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>