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Fix a bug where snapped windows in splitview while still in overview
do not have their headers painted. Make CustomFrameViewAshBase look for
splitview state changes, and repaint the header if the state is snap
left or snap right.

Test: ash_unittests CustomFrameViewAshTest.HeaderVisibility*
Bug: 789378
Change-Id: I7ff65181134205544af2a717a3ee3e3797aa2ad2
Reviewed-on: https://chromium-review.googlesource.com/797681
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521114}