Merge "[2/n] Adds reachability education for double-tap" into tm-qpr-dev am: 4970f339

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21911724



Change-Id: Ic31d4decd5c3578187f21cbff3f6510f07588928
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>