Modify SkGpuBlurUtils::GaussianBlur's reexpand method and allow more approx fit intermediates

This CL didn't cause and gm or skp image diffs locally but, since the backing fit is being changed in some cases, it is likely to do so on some bot.

Change-Id: I13decf44fb12e457951381bcc9c2c15103553a43
Reviewed-on: https://skia-review.googlesource.com/125225
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed