Scale Viewer status by backing scale.

The Viewer status box 's' is quite small on high resolution displays.
The 'u' key doubles its size and has been used as a work-around, but
let the status box scale take the backing scale into account.

Change-Id: I98db37a4ed86698ba7c02666478dff248ff6daae
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/374377
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed