Use high precision for TextureOp texture coord varying

Change-Id: Iadcae79f7b295a3bedd33b4a93734547665f2a5d
Reviewed-on: https://skia-review.googlesource.com/41380
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed