The second divider is shown after we set a background to the pinned
header.
- Simply hide the pinned header instead of its inner views.
- Move setActionBarShadowAnimation to controller and just call it when
the bar chart is available.
Fixes: 134652710
Test: robotest, visual
Change-Id: I4381e5ca1a042583d3e5874f5600719267b19786
f3e3d7a46b