Use L's new notification and media session API.

Change-Id: Id90abf359bf98c3ea4fd2c44416ce6cd7d7a80de
Update Notification background color

This change uses Palette to update Apollo's Notification background
color based on the current artwork.

It also removes the timestamp from the Notification.

Change-Id: I0c53ad7a9b5ae8b585059ae145beec28dbea3b44
Add Palette to Apollo's mk

Change-Id: Ic98ede9df612845b401a616ec9e34269a934618f
Merge branch 'remote' into mkl