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Add a fuzzer for Chromium that is very closely based off of [1].

Rename harfbuzz_fuzzer to hb_shape_fuzzer. Apply some formatting
changes in hb_shape_fuzzer.cc to adhere to the Chromium style guide.

[1] https://github.com/harfbuzz/harfbuzz/blob/master/test/fuzzing/hb-subset-fuzzer.cc

Bug: 1046803
Change-Id: Ide991e12f95d6733bbd71acc265c444972b8be99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032170Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738721}