Fix wrong dock stack bounds after rotation.

When setting the stack bounds from the system UI we need depend on
DisplayInfo.logicalWidth/Height instead of DisplayMetrics.
DisplayMetrics have values adjusted for status bar and nav bar, but the
Activity Manager doesn't know about that. It expects the stack bounds to
use full display size.

Bug: 25665425
Change-Id: Idf5f3192105b72686d1ad11fe4f42c894bb87fbe