Add NetworkListObserver utility class.

ppapi/tests/test_network_monitor_private.h

 // Copyright (c) 2012 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 PAPPI_TESTS_TEST_NETWORK_MONITOR_PRIVATE_H_
 #define PAPPI_TESTS_TEST_NETWORK_MONITOR_PRIVATE_H_
 
 #include <string>
 
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/tests/test_case.h"
 
+namespace pp {
+class NetworkListPrivate;
+}  // namespace pp
+
 class TestNetworkMonitorPrivate : public TestCase {
  public:
   explicit TestNetworkMonitorPrivate(TestingInstance* instance);
 
   // TestCase implementation.
   virtual bool Init();
   virtual void RunTests(const std::string& filter);
 
  private:
   std::string TestBasic();
   std::string Test2Monitors();
   std::string TestDeleteInCallback();
+  std::string TestListObserver();
 
-  std::string VerifyNetworkList(PP_Resource network_resource);
+  std::string VerifyNetworkListResource(PP_Resource network_resource);
+  std::string VerifyNetworkList(const pp::NetworkListPrivate& network_list);
 };
 
 #endif  // PAPPI_TESTS_TEST_NETWORK_MONITOR_PRIVATE_H_