In viewport setup time, pre-calculate the more likely view scale
and text wrap scale instead of waiting until ZoomManager's FirstLayout
time. This is to give webkit better and more correct information, such
as window width/height and inner width/height, when it is doing first layout.
issue: 3382398
Change-Id: I53fb15da43fbede6c03a4f51ec1c50e9a94f0236
76064644a7