Add FlushForTesting to InterfacePtr and Binding.

mojo/public/cpp/bindings/strong_binding.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_STRONG_BINDING_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_STRONG_BINDING_H_
 
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 96 matching lines @@
   Interface* impl() { return binding_.impl(); }
   // Exposed for testing, should not generally be used.
   internal::Router* internal_router() { return binding_.internal_router(); }
 
   void OnConnectionError() {
     if (!connection_error_handler_.is_null())
       connection_error_handler_.Run();
     delete binding_.impl();
   }
 
+  // Sends a message on the underlying message pipe and runs the current
+  // message loop until its response is received. This can be used in tests to
+  // verify that no message was sent on a message pipe in response to some
+  // stimulus.
+  void FlushForTesting() { binding_.FlushForTesting(); }
+
  private:
   base::Closure connection_error_handler_;
   Binding<Interface> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(StrongBinding);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_STRONG_BINDING_H_