Always create a raster (cached) image

This avoids bugs in Viewer when starting in GL or Vulkan, then trying to
reuse the image that points to a (possibly deleted) context when
switching backends.

Bug: skia:
Change-Id: I4628aba5298bb733b8f4bb562cdbc872779d2829
Reviewed-on: https://skia-review.googlesource.com/90882
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed