Merge "Add a description to the params of keep clear rects APIs." into tm-dev am: f829b133

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17772404



Change-Id: I74feba5ef01754a69421460ffc4bddaa2a97aed1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>