[Cast MRP] Completed 1UA mode.

The change allows a Presentation API to control a 1UA mode presentation.

Bug: 1069126
Change-Id: I943293d884c77319f865273105cf93f0c6727ee2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2186109
Commit-Queue: John Williams <jrw@chromium.org>
Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768538}

chrome/browser/media/router/providers/cast/cast_activity_manager.cc

@@ -89,6 +89,8 @@ void CastActivityManager::LaunchSession(
       MediaRoute::GetMediaRouteId(presentation_id, sink_id, source);
   MediaRoute route(route_id, source, sink_id, /* description */ std::string(),
                    /* is_local */ true, /* for_display */ true);
+  route.set_presentation_id(presentation_id);
+  route.set_local_presentation(true);
   route.set_incognito(incognito);
   if (cast_source.ContainsStreamingApp()) {
     route.set_controller_type(RouteControllerType::kMirroring);