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This CL makes AgentSchedulingGroup and its host, implement the
mojom::RouteProvider and blink::mojom::AssociatedInterface interfaces.
This will make it possible in the future to register ASG-specific routes
instead of process-global routes, as well as ASG-specific associated
interfaces, as opposed to interfaces that are associated with the
process-global IPC channel.

Currently the implementations of these interfaces are not operational.
Later CLs will flesh out this implementation so we can begin migrating
interfaces over to the ASG scope.

Bug: 1111231
Change-Id: I3da0a31d31018b18ab616e02f351d3d0876c7694
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415949
Commit-Queue: Dominic Farolino <dom@chromium.org>
Reviewed-by: Tal Pressman <talp@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810101}