Fix gradients gm

Some of my local changes slipped into the tree.

BUG=skia:

Change-Id: I6e452f12608db6b80c5887ccd3cac199cfbf9494
Reviewed-on: https://skia-review.googlesource.com/7625
Reviewed-by: Matt Sarett <msarett@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Matt Sarett <msarett@google.com>
1 file changed