tree b1b7e062128d1f661d69f2845fecca322974229e
parent d1b6dcbea63c688650d13d77156526581db27630
author Dan Sandler <dsandler@android.com> 1485369698 -0500
committer Dan Sandler <dsandler@android.com> 1485405426 -0500

Notification Channels come to SystemUI's own notifications.

There are five channels at present:
    ALERTS - low battery etc.
    SCREENSHOTS - progress & result
    SECURITY - notifications hidden due to policy
    STORAGE - disk low
    STATUS - basically everything else

The importance for each channel should match the legacy
priority of the notifications it carries.

Bug: 34250937
Test: runtest systemui
Change-Id: I5915ca453258caea63b0d9bd756893db05e8d600