Merge "Correct comments in StackScrollAlgorithm" into tm-qpr-dev am: b6128c6b am: df93ebe8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21423564



Change-Id: I2adf2cc6385d0201874dd11d7943248fc841477e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>