Reland the combined 3 pass image blur with a fix to the bounds calculation

Use the old bounds calculation so that CPU and GPU agree. Adjust all the
combined 3 pass code to use the new bounds.

This reverts commit 59f8f154872a66433eb1dfccd3d56b540193089e and
fixes bound calculation.

Original change's description:
> Revert "Use combined three pass code for image blur."
>
> This reverts commit d4a0fc7383546d106db2216515b3753937398ece.
>
> Reason for revert: Too naive about bounds
>
> Original change's description:
> > Use combined three pass code for image blur.
> >
> > This changes more closely matches the GL output, and the runtimes are similar or
> > faster for the common cases.
> >
> > x86_64 times:
> > benchmark                            old-Us   new-Us   old/new
> > blur_image_filter_large_80.00_80.00  4842.04  2626.10  1.84381
> > blur_image_filter_small_80.00_80.00  3297.72  854.97   3.85712
> > blur_image_filter_large_10.00_10.00  930.44   720.50   1.29138
> > blur_image_filter_small_10.00_10.00  69.96    42.15    1.65979
> > blur_image_filter_large_1.00_1.00    682.66   521.78   1.30833
> > blur_image_filter_small_1.00_1.00    19.21    14.43    1.33125
> > blur_image_filter_large_0.50_0.50    696.17   64.14    10.8539
> > blur_image_filter_small_0.50_0.50    16.26    5.02     3.23904
> >
> > arm64 times:
> > benchmark                            old-Us    new-Us    old/new
> > blur_image_filter_large_80.00_80.00  42144.53  14128.42  2.98296
> > blur_image_filter_small_80.00_80.00  24840.58  4392.58   5.65512
> > blur_image_filter_large_10.00_10.00  3556.40   3793.70   0.937449
> > blur_image_filter_small_10.00_10.00  282.53    220.62    1.28062
> > blur_image_filter_large_1.00_1.00    2502.20   2937.99   0.851671
> > blur_image_filter_small_1.00_1.00    83.32     81.93     1.01697
> > blur_image_filter_large_0.50_0.50    5643.80   272.83    20.6861
> > blur_image_filter_small_0.50_0.50    141.02    38.29     3.68295
> >
> > Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Release-All-SKNX_NO_SIMD
> > Change-Id: Ic53b3186607d5485477b92e4ca7b092bf1366c52
> > Reviewed-on: https://skia-review.googlesource.com/52771
> > Commit-Queue: Herb Derby <herb@google.com>
> > Reviewed-by: Mike Klein <mtklein@google.com>
>
> TBR=mtklein@google.com,herb@google.com,senorblanco@chromium.org
>
> Change-Id: Idf679a8fc6d777625ad9527b843aa1614d878cba
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Release-All-SKNX_NO_SIMD
> Reviewed-on: https://skia-review.googlesource.com/60900
> Reviewed-by: Herb Derby <herb@google.com>
> Commit-Queue: Herb Derby <herb@google.com>

Change-Id: Idda0d83b1e2f753c9c8e703f9506dd31b117ec55
Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Release-All-SKNX_NO_SIMD
Reviewed-on: https://skia-review.googlesource.com/61320
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>

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