Merge "Update text string for performance boost notification" into udc-dev am: 6cab17b4 am: 3da4a037

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21662038



Change-Id: I2ed1b7178a71cad99a0c9a9f582bcfccaf20ecbf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>