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This is a reland of ae3270a7

The original CL made it through the CQ without triggering a compile
step, hence the post-landing breakage.

This has now been tested locally under a debug configuration and
will trigger Android compiles in the CQ, so it should be safe to
re-land if it passes.

Original change's description:
> Decompose some Blink public mojom targets
>
> This picks some low-hanging fruit in the effort to decompose Blink mojom
> into smaller targets.
>
> Bug: 1058621
> Change-Id: Iaf1a8efffa43f64ea7e618555262b929235ca2eb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088677
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Commit-Queue: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/master@{#747044}

Bug: 1058621
Change-Id: I11d8c1e996e1cf178616fd6736ba2d0f7b624edb
Tbr: haraken@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090012Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#747384}