Fix DeferredTextureImage test on Mac

Change-Id: I34cf12b2aa16b2441b9e57162cbaee1444f42c52
Reviewed-on: https://skia-review.googlesource.com/29607
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed