Merge "Merge "Allow the down volume key to silence notifs" into qt-qpr1-dev...
Merge "Merge "Allow the down volume key to silence notifs" into qt-qpr1-dev am: 71148077" into qt-qpr1-dev-plus-aosp
am: 5fda43f0
Change-Id: I236cc5ab492689360fbc0113d3e59bd8a874a42e