Merge "Make footer button tap target 48dp tall" into sc-qpr1-dev am:...

Merge "Make footer button tap target 48dp tall" into sc-qpr1-dev am: be7e7e2d am: 030ba379 am: 68d8dcf4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15854192

Change-Id: I708691e0a1d96ac1679eb549139fdd9f6eae28aa