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This is a reland of 769719f1

Original change's description:
> Adding mojolpm fuzzer generators.
> 
> This adds code that generates libprotobuf-mutator based
> structure-aware fuzzers as part of the mojom compilation process.
> (changes in //mojo).
> 
> This is a cherrypick/split from
> https://chromium-review.googlesource.com/c/chromium/src/+/2108507
> 
> Pragmatic fixes for the remaining missing dependencies.
> 
> Change-Id: I0e0d34a4b99b31f99ee872fb95be993043aef402
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2170830
> Commit-Queue: Mark Brand <markbrand@google.com>
> Reviewed-by: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/master@{#771513}

Change-Id: Ie477695c59001f51fb25e25b3c98291cb5cf0013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2214883Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Mark Brand <markbrand@google.com>
Cr-Commit-Position: refs/heads/master@{#772642}