[Media Router] Add ProvideSinks() Mojo API

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 808999261581905bae91ffa67e1764a5847b2c7d..92eb94de0ef5d3ed81570b2c76a76e768dd50b95 100644
--- a/chrome/browser/media/router/mojo/media_router.mojom
+++ b/chrome/browser/media/router/mojo/media_router.mojom
@@ -362,6 +362,11 @@ interface MediaRouteProvider {
               string media_source,
               SinkSearchCriteria search_criteria) =>
                   (string sink_id);
+
+  // Called when the list of MediaSinks discovered by Media Router has been
+  // updated. The sinks are supplied to the MediaRouteProvider so that they can
+  // be used for other operations, such as route creation.
+  ProvideSinks(string provider_name, array<MediaSink> sinks);
 };
 
 // Interface for a service which observes state changes across media