Add GetCurrentRoutes() to MediaRouter API, ensure dialog has routes at init

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 a550715b3ed37422665cd77bd25faaed7cf579ac..1a0ab8d947142546a1265c9baab0444ce576ed56 100644
--- a/chrome/browser/media/router/media_router.h
+++ b/chrome/browser/media/router/media_router.h
@@ -181,6 +181,8 @@ class MediaRouter : public KeyedService {
   // This will terminate all incognito media routes.
   virtual void OnIncognitoProfileShutdown() = 0;
 
+  virtual std::vector<MediaRoute> GetCurrentRoutes() const = 0;

[imcheng, 2016/11/30 19:54:06]

1) return const ref?
2) Add comments

[takumif, 2016/12/01 03:26:37]

Done.

+
  private:
   friend class IssuesObserver;
   friend class MediaSinksObserver;