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

chrome/browser/media/router/mojo/media_router.mojom

Index: chrome/browser/media/router/mojo/media_router.mojom
diff --git a/chrome/browser/media/router/mojo/media_router.mojom b/chrome/browser/media/router/mojo/media_router.mojom
index 683904122489d906d2ffbca2765f76648c824c13..7a7f2c0ff77696599d5692544050e4ebb9c9b590 100644
--- a/chrome/browser/media/router/mojo/media_router.mojom
+++ b/chrome/browser/media/router/mojo/media_router.mojom
@@ -286,6 +286,9 @@ interface MediaRouteProvider {
   // Calling this will trigger a firewall prompt on Windows if there is not
   // already a firewall rule for mDNS.
   EnableMdnsDiscovery();
+
+  // Update media sinks capable of displaying |media_source|.

[imcheng, 2016/04/15 18:37:02]

s/Update/Updates

[amp, 2016/04/15 20:29:33]

Done.

+  UpdateMediaSinks(string media_source);
 };
 
 // Interface for a service which observes state changes across media