Disable resource cache in shadow_utils GM for now

This should make the GMs more stable in tiled mode.

Change-Id: I72996b1305fc99e60626af35267952d0a5c38624
Reviewed-on: https://skia-review.googlesource.com/17275
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed