[Presentation API] 1-UA presentation support + presenter APIs.

extensions/renderer/resources/media_router_bindings.js

Index: extensions/renderer/resources/media_router_bindings.js
diff --git a/extensions/renderer/resources/media_router_bindings.js b/extensions/renderer/resources/media_router_bindings.js
index 172b91b094130d58d88528847efe5edc2c3d31c5..af3a0944b5464ec2aae8a208763a6dee1e77a342 100644
--- a/extensions/renderer/resources/media_router_bindings.js
+++ b/extensions/renderer/resources/media_router_bindings.js
@@ -73,7 +73,8 @@ define('media_router_bindings', [
       'is_local': route.isLocal,
       'custom_controller_path': route.customControllerPath,
       // TODO(imcheng): Remove logic when extension always sets the field.
-      'for_display': route.forDisplay == undefined ? true : route.forDisplay
+      'for_display': route.forDisplay == undefined ? true : route.forDisplay,
+      'is_offscreen_presentation': route.isOffscreenPresentation || false
     });
   }