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For now the listener map is only used for obtaining a RouteProvider
(with a fallback to the process/thread). In the future it will also be
used for routing incoming IPCs for the ASG's listeners.

Bug: 1111231
Change-Id: I0a82f5681767b48751407ecbe8be7e7b6ecf506d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513958
Commit-Queue: Tal Pressman <talp@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826548}