perf: Send boost hint during initial launch

Change-Id: I26afc909c35e514958894b0a07a650a20ce6e537
SystemUI: Fix crash during notification/theme change

Fixes crashing that could occur when a notification is created
during a theme change. Entries were attempting to be added
to views which did not have a layout pass yet, causing it to fail.

When a theme change occurs, the fix is to halt the ticker and command queue
until a layout occurs.

BUGDUMP-151925

Change-Id: Ic19d26178df673a1d52981a8617415e6fbcb219d
Merge remote-tracking branch 'ap/kitkat' into kitkat