Add SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS to SkUserConfig.h
Add SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS to SkUserConfig.h

An upcoming Skia change will obviate the need for this #define,
and we'll remove it and rebaseline.

TBR=robertphillips@google.com
BUG=skia:3194

Review URL: https://codereview.chromium.org/1513593002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#363900}

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