Turn off mip map support in GrDawnCaps

GrDawnGpu::onRegenerateMipMapLevels() is not implemented. Set mip map
support to false in GrDawnCaps so that the function is not called.

Change-Id: I342c59d171d21250ee4da400f58b6da54a04ca8c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272139
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
1 file changed