Reland "Reland of: [code coverage] Add all fuzzer targets"

This is a reland of 80cee65bec02ee6edbd88670120867bc0af8e028

Original change's description:
> Reland of: [code coverage] Add all fuzzer targets
>
> Now with a fix for the issue in GenerateIsolates().
>
> R=jbudorick,stgao,liaoyuke
>
> > Change-Id: I78ffec6525cd1d808a4b431ae1e2729b76357d46
> > Reviewed-on: https://chromium-review.googlesource.com/c/1372917
> > Commit-Queue: Shuotao Gao <stgao@chromium.org>
> > Reviewed-by: Shuotao Gao <stgao@chromium.org>
> > Reviewed-by: John Budorick <jbudorick@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#615834}
>
> Change-Id: I4ae0ef2588026bb6e0e5501e9ff39a7852d89afa
> Reviewed-on: https://chromium-review.googlesource.com/c/1374777
> Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#616169}

Change-Id: I360303f0c4ecb2b818c4ad6e936d3d4b1dfb1807
Bug: 914776
Reviewed-on: https://chromium-review.googlesource.com/c/1376321
Reviewed-by: Shuotao Gao <stgao@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Shuotao Gao <stgao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616716}
8 files changed