Scale Viewer status by backing scale.
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 <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Commit-Queue: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>

google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia