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This requires the following changes:

* It must be possible for the Java App to turn DevTools on. To implement this I opted for
an interface similar to AwDevToolsServer.

* Telemetry expects the DevTools version query contain a product with a
recognizable version number.  This requires overriding ContentBrowserClientImpl::GetProduct

* Telemetry expects DevTools targets to be discoverable, this requires overriding the
DevToolsManagerDelegate.

Bug: 1022812
Change-Id: Idae5ac1aa05e700781c96181d3fec0ab3776003c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906151
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715019}