[Media Router] Add features to control browser side discovery

chrome/browser/media/router/media_router_feature.h

Index: chrome/browser/media/router/media_router_feature.h
diff --git a/chrome/browser/media/router/media_router_feature.h b/chrome/browser/media/router/media_router_feature.h
index 07a1e8746274ec00c11aa32641b24794398490cd..d4bc4b9988aa61f80065a01425a7ec7d0bf82076 100644
--- a/chrome/browser/media/router/media_router_feature.h
+++ b/chrome/browser/media/router/media_router_feature.h
@@ -14,6 +14,14 @@ namespace media_router {
 // Returns true if Media Router is enabled for |context|.
 bool MediaRouterEnabled(content::BrowserContext* context);
 
+#if !defined(OS_ANDROID)
+// Returns true if browser side DIAL discovery is enabled.
+bool DialLocalDiscoveryEnabled();
+
+// Returns true if browser side Cast discovery is enabled.
+bool CastDiscoveryEnabled();
+#endif
+
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_FEATURE_H_