[Media Router] Add a supports_web_ui_controller attribute to MediaRoute

chrome/common/media_router/media_route.h

Index: chrome/common/media_router/media_route.h
diff --git a/chrome/common/media_router/media_route.h b/chrome/common/media_router/media_route.h
index 0b9c1d40f248e5346520f06ec0ec4e2d5e305b1c..46562ee3a11efb55e170200f8741bd756d460792 100644
--- a/chrome/common/media_router/media_route.h
+++ b/chrome/common/media_router/media_route.h
@@ -78,6 +78,13 @@ class MediaRoute {
     return custom_controller_path_;
   }
 
+  void set_supports_web_ui_controller(bool supports_web_ui_controller) {
+    supports_web_ui_controller_ = supports_web_ui_controller;
+  }
+  bool supports_web_ui_controller() const {
+    return supports_web_ui_controller_;
+  }
+
   void set_for_display(bool for_display) { for_display_ = for_display; }
   bool for_display() const { return for_display_; }
 
@@ -114,6 +121,9 @@ class MediaRoute {
   // the media router dialog.
   std::string custom_controller_path_;
 
+  // Whether the provider for this route supports WebUI route controllers.
+  bool supports_web_ui_controller_;
+
   // |true| if the route can be displayed in the UI.
   bool for_display_ = false;