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The FreeType-Testing GitHub repository is a project connected to
the FreeType font rasterisation library which provides a set of
fuzzing-harnesses for oss-fuzz. After issue 1139963 we want to build and
run a fuzzing configuration that matches the FreeType build
configuration that we use for Chromium. This CL achieves that for the
first harness: truetype-render-fuzzer, the main glyph rasterisation
harness.

The CL adds the GPL-licensed FreeType-Testing repository to third-party
as a non-shipping dependency in order to be able to build the same
harnesses as part of Chromium and against Chromium's freetype-harfbuzz
build target.

It defines a fuzzer_test build target to build the
TrueTypeRenderFuzzTarget and defines which seed_corpus directory to use
from the freetype-testing set of corpora.

Bug: 1140584
Cq-Include-Trybots: luci.chromium.try:linux-libfuzzer-asan-rel
Change-Id: Icb2ab2d4ee65fd7d1d45ebfe9ca01ff0ef3628e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529104Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Ben Wagner <bungeman@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826696}