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Chromecast needs to know which application session
certain CastRenderer/CmaBackend is created for
(see b/79265398). In order to establish the association
between the application session and the CastRenderer,
we need to pass a std::string type |application_session_id|
into the CastRenderer initialization process.

This CL adds a |host_interfaces_| member in CastRenderer
and an ApplicationSessionIdManager service that's
attached to RenderFrameHost. During Initialization process,
the CastRenderer uses |host_interfaces_| to obtain the
ApplicationSessionIdManager service and then retrives
the corresponding |applicationSessionId| from such service.

Bug:internal b/79265398
Test:

1. verified a special case (LocalAudioRenderer) is not broken.
2. cherry-picked into internal Chromecast and verified real
ID arrived at CastRenderer.

Change-Id: Ief94a532dbdc346516333e981c8f445efb3a4333
Reviewed-on: https://chromium-review.googlesource.com/1117840
Commit-Queue: Guohui Deng <guohuideng@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572211}