set correct bounds in ActionBar based on visibility of ActionBarView

set correct bounds in ActionBar based on visibility of ActionBarView

ActionBarContainer was setting the bounds of its background assuming the
visibility of the ActionBarView. But that view becomes GONE when the
ActionBarContextView is visible, causing artifacts such as wrong shadows
when resized (as in custom configuration changes).

Issue #17280341 Quantum: drop shadow on CAB has wrong width after rotation on L, when configuration change is handled by the app

Change-Id: I07e57f00e27b41d5370cb9440b35734a8ec10f3a