Avoid making new image snapshot in GPU->GPU SkSurface::draw() Bug: chromium:943561 Change-Id: I4b5cd545fb31bbaaf7828a2a90a88a0bfb179c87 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/202400 Reviewed-by: Robert Phillips <robertphillips@google.com> Commit-Queue: Brian Salomon <bsalomon@google.com>