Merge changes I1bad66e2,Ibc93597e,Id985fc28 into nyc-dev
am: fef8cfc3
* commit 'fef8cfc3':
Remove the highlight on the overview button in the screen pinning dialog
Fixing bad regression in alt-tab layout.
Workaround to ensure that a SystemUI process is always available.
Change-Id: I7072dc07c1e034d568df14a0b9a12134b24f823b