SkQP: stop using global across jni calls

BIG=skia:7572
Change-Id: I9231e5264305eb871e31ec7b9d23c042135bbefc
Reviewed-on: https://skia-review.googlesource.com/103022
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed