Mojo C++ bindings: support passing associated interface pointers/requests in method parameter lists…

mojo/public/cpp/bindings/lib/interface_ptr_state.h

Index: mojo/public/cpp/bindings/lib/interface_ptr_state.h
diff --git a/mojo/public/cpp/bindings/lib/interface_ptr_state.h b/mojo/public/cpp/bindings/lib/interface_ptr_state.h
index cb38dceb8f7f335e4f3dc7c56a2e470883a6020f..39710b209478b803d369ec8aa7c016718526945d 100644
--- a/mojo/public/cpp/bindings/lib/interface_ptr_state.h
+++ b/mojo/public/cpp/bindings/lib/interface_ptr_state.h
@@ -320,7 +320,8 @@ class InterfacePtrState<Interface, true> {
     endpoint_client_.reset(new InterfaceEndpointClient(
         router_->CreateLocalEndpointHandle(kMasterInterfaceId), nullptr,
         make_scoped_ptr(new typename Interface::ResponseValidator_())));
-    proxy_.reset(new Proxy(endpoint_client_.get(), endpoint_client_->router()));
+    proxy_.reset(new Proxy(endpoint_client_.get()));
+    proxy_->serialization_context()->router = endpoint_client_->router();
 
     waiter_ = nullptr;
   }