Update view manager to support content handling.

mojo/services/public/interfaces/content_handler/content_handler.mojom

Index: mojo/services/public/interfaces/content_handler/content_handler.mojom
diff --git a/mojo/services/public/interfaces/content_handler/content_handler.mojom b/mojo/services/public/interfaces/content_handler/content_handler.mojom
index 6c07580e30a0c81b767fb1b618cddbe4cb586aa5..97d5dc45635b4424543ce755b62942accee4c7ef 100644
--- a/mojo/services/public/interfaces/content_handler/content_handler.mojom
+++ b/mojo/services/public/interfaces/content_handler/content_handler.mojom
@@ -7,10 +7,15 @@ import "mojo/services/public/interfaces/network/url_loader.mojom"
 
 module mojo {
 
+struct ContentHandlerResponse {
+  URLLoader loader;
+  URLResponse response;
+};
+
 interface ContentHandler {
   OnConnect(string url,
-            URLResponse url_response,
-            ServiceProvider service_provider);
+            ContentHandlerResponse response,
+            ServiceProvider&? service_provider);
 };
 
 }