Summary: Runtime and Debugger agents are shipped with JSC so we reuse them. Messages are routed to them through the `LegacyDispatcher` which also handles translating their events. The Page agent emits the `Page.getResourceTree` method that the Chrome inspector expects.
Reviewed By: michalgr
Differential Revision: D4021499
fbshipit-source-id: a93d0add01cee732401f8e8db1d43205bfbd4cd4
Alexander Blom