KeygaurdBottomArea additional API cleanup
* Moves alpha setting of the ambient indication area into KBAV, as it
already manages alpha for other child views
* Removes the need to get the ambient indication area from
CentralSurfaces
* Cleans up overly poweful getter that gets the indication area from
KBAV to only return a weaker object: an animator, one per each
of the two indication areas
Bug: 235403546
Test: manually verified that the bottom buttons and "which song is
playing?" area show, hide, and animate appropriately.
Change-Id: I47760e3d400e01bfb6b1fa1cdaa6ae6dcd5ea521
5 files changed
