Don't pass final W/H to convolve_gaussian() in SkGpuBlurUtils.
Don't pass final W/H to convolve_gaussian() in SkGpuBlurUtils.

It is used for clipping. The clip doesn't seem to affect
correctness. I don't think it matters for performance. I ran
through all GMs, skps, svgs in gl and ddl2-gl configs with
breakpoints set if the clip ever did not contain the drawn
rect. No hits. If I missed something could we just shrink the
rects we draw rather than use a scissor clip?

The values seemed wrong (too big) in the decimate/reexpand case.
Shouldn't they have been scaled?

Change-Id: Icc22eb27d133fc436d891dab70483be5f71df894
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265217
Commit-Queue: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>
Reviewed-by: Michael Ludwig <cb1f3dd24de0f0b611b26bc28bec758a551d9b7d@google.com>

aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,google/skia,HalCanary/skia-hc,google/skia