Attempt to fix AMD ANGLE bots.

Makes the second context used for image tests be of the same type as it was before https://skia.googlesource.com/skia/+/6405e71279e99731f89db69325c6763ec62a98e1

Change-Id: Id861214e5bea2b874ba5eae4489a982340c2f101
Reviewed-on: https://skia-review.googlesource.com/9912
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed