Fix a bug in SkGpuBlurUtils::GaussianBlur (take 2) This fixes the remaining imageblurclampmode bug and a preexisting un-reported error in the imageblurrepeatmode GM. This relies on https://chromium-review.googlesource.com/c/chromium/src/+/1044113 (Add a flag to disable a blur imagefilter bug fix in Skia) landing in Chrome first. Bug: skia:7765 Change-Id: I568d18c17bb95c9e270e4cfd304c8dc134a48a70 Reviewed-on: https://skia-review.googlesource.com/125961 Reviewed-by: Greg Daniel <egdaniel@google.com> Commit-Queue: Robert Phillips <robertphillips@google.com>