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Add a class that emits the minimal set of messages to collect JS code
coverage via Chrome Devtools Protocol from a WebContents host.

Bug: 1113941
Change-Id: I3119f4417cf3b49a16428888126c3bfa639472c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347265Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813115}