Add dedicated fuzzer for SVG parsing code

Follow-up to https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=68723

The code parsing code path is exercised through our SVG fuzzer, but
more direct fuzzing could be useful, as well as fuzzing our
"ToSVGString" code.

Change-Id: I114d4ad3e1457aa6b13d986d08c1a7cfa9ebbf22
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/849831
Auto-Submit: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Kaylee Lubick <kjlubick@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
3 files changed