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This is a reland of 96b8d308

Original change's description:
> Adding mojolpm fuzzer.
>
> This adds code that generates libprotobuf-mutator based
> structure-aware fuzzers as part of the mojom compilation process.
> (changes in //mojo).
>
> It also adds a fuzzer for CodeCacheHost using this framework to demonstrate
> how it will be used, and documentation explaining that fuzzer and how to use
> this generator to write new fuzzers. (changes in //content/test).
>
> It finally includes a few changes to typemap and traits files that
> were necessary to smooth over some inconsistencies in existing code
> using mojo.
>
> Bug: 941849
> Change-Id: I660a57bd90c0963bd9a0b8608c746cdb767edc98
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978739
> Commit-Queue: Mark Brand <markbrand@google.com>
> Auto-Submit: Mark Brand <markbrand@google.com>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
> Reviewed-by: Oliver Chang <ochang@chromium.org>
> Reviewed-by: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/master@{#746827}

Bug: 941849
Change-Id: I01feb96401e1c9cbd3bbb2bf2a22ecc253d36b4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087408
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Oliver Chang <ochang@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751464}