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This is a reland of 0ea77a78
Original change's description:
> [DevTools] Switch shared worker inspection from routing id to SharedWorkerHost
>
> This is a preparation to replace routing id + legacy IPC with Mojo interface
> retrievable from SharedWorkerHost.
>
> Temporarily duplicated some code from WorkerDevToolsAgentHost, which
> makes it possible to migrate shared and service workers separately.
>
> Removed a test for WORKER_STATE manipulations altogether with the state itself.
>
> Bug: 776009
> Change-Id: Id884f4f5009eb70148251c94cae9629d5a1f6e8e
> Reviewed-on: https://chromium-review.googlesource.com/783110
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
> Reviewed-by: Alexei Filippov <alph@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#521277}

TBR=alph@chromium.org, horo@chromium.org

Bug: 776009
Change-Id: I0c0bbf56e5faf44fbf4cb7e12ea2b507c840fed2
Reviewed-on: https://chromium-review.googlesource.com/809466Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521901}