Fix scrolling view position with fitSystemWindows parent

Currently the scrolling view is not positioned correctly
if the CoordinatorLayout is set to fitSystemWindows, but
none of its children are. This CL fixes that by properly
insetting the scrolling view.

BUG: 29125508
Change-Id: I3b802f98197ee50e9caee610c32631daeb5af9aa
5 files changed