[Media Router] Wire through a new MRPM call to update media sinks.

chrome/browser/media/router/mojo/media_router_mojo_impl.h

Index: chrome/browser/media/router/mojo/media_router_mojo_impl.h
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_impl.h b/chrome/browser/media/router/mojo/media_router_mojo_impl.h
index 9b14874c969637c78093576eb11df3832b578f47..fc8c6c3f1a579754fa2322d7d7cefc7905db3d46 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_impl.h
+++ b/chrome/browser/media/router/mojo/media_router_mojo_impl.h
@@ -335,6 +335,12 @@ class MediaRouterMojoImpl : public MediaRouterBase,
   void OnFirewallCheckComplete(bool firewall_can_use_local_ports);
 #endif
 
+  // Requests MRPM to update media sinks.  This allows MRPs that only do
+  // discovery on sink queries an opportunity to update discovery results
+  // even if the MRP SinkAvailability is marked UNAVAILABLE.
+  void UpdateMediaSinks(const MediaSource::Id& source_id);
+  void DoUpdateMediaSinks(const MediaSource::Id& source_id);
+
   // Pending requests queued to be executed once component extension
   // becomes ready.
   std::deque<base::Closure> pending_requests_;