Python bindings: Add helper function to create InterfaceRequest

mojo/public/python/mojo_bindings/reflection.py

Index: mojo/public/python/mojo_bindings/reflection.py
diff --git a/mojo/public/python/mojo_bindings/reflection.py b/mojo/public/python/mojo_bindings/reflection.py
index 35b8ff294a16019dc07e16d1d59ea23e6083d457..c9e4ee0017171eaa7eb6d2481354b0b1fe9d8061 100644
--- a/mojo/public/python/mojo_bindings/reflection.py
+++ b/mojo/public/python/mojo_bindings/reflection.py
@@ -12,6 +12,7 @@ import sys
 import mojo_bindings.messaging as messaging
 import mojo_bindings.promise as promise
 import mojo_bindings.serialization as serialization
+import mojo_system
 
 
 class MojoEnumType(type):
@@ -273,6 +274,10 @@ class InterfaceManager(object):
 
     router.Start()
 
+  def NewRequest(self):
+    pipe = mojo_system.MessagePipe()
+    return (self.Proxy(pipe.handle0), InterfaceRequest(pipe.handle1))
+
   def _InternalProxy(self, router, error_handler):
     if error_handler is None:
       error_handler = _ProxyErrorHandler()