[Media Router] Wiring for searching route providers for new sinks.

chrome/browser/media/router/media_router.h

Index: chrome/browser/media/router/media_router.h
diff --git a/chrome/browser/media/router/media_router.h b/chrome/browser/media/router/media_router.h
index f8d6f283b909d493288100bad1c912a6994b03c6..ee22364159560ae8d0a62535ea959cd0d6065936 100644
--- a/chrome/browser/media/router/media_router.h
+++ b/chrome/browser/media/router/media_router.h
@@ -31,8 +31,10 @@ namespace media_router {
 class IssuesObserver;
 class MediaRoutesObserver;
 class MediaSinksObserver;
+class MediaSinksSearchRequest;
 class PresentationConnectionStateObserver;
 class PresentationSessionMessagesObserver;
+class QueryResultManager;
 class RouteRequestResult;
 
 // Type of callback used in |CreateRoute()|, |JoinRoute()|, and
@@ -164,6 +166,7 @@ class MediaRouter : public KeyedService {
   friend class MediaRoutesObserver;
   friend class PresentationConnectionStateObserver;
   friend class PresentationSessionMessagesObserver;
+  friend class QueryResultManager;
 
   // The following functions are called by friend Observer classes above.
 
@@ -185,6 +188,18 @@ class MediaRouter : public KeyedService {
   // receiving further updates.
   virtual void UnregisterMediaSinksObserver(MediaSinksObserver* observer) = 0;
 
+  // Registers |request| with this MediaRouter. |request| specifies a media
+  // source and a sink ID. The MediaRouter will ask the Media Router Provider
+  // Manager to search for sinks matching the sink ID that also support the
+  // media source. |request| will be notified when the MRPM responds and then it
+  // will be destroyed.
+  // Multiple requests can be registered for the same sink ID. Only one query
+  // per sink ID will be pending at one time.
+  // The implementation can reject the request to search in which case it will
+  // notify the caller by returning |false|.
+  virtual bool RegisterMediaSinksSearchRequest(
+      scoped_ptr<MediaSinksSearchRequest> request) = 0;
+
   // Adds a MediaRoutesObserver to listen for updates on MediaRoutes.
   // The initial update may happen synchronously.
   // MediaRouter does not own |observer|. |UnregisterMediaRoutesObserver| should