Add NetworkList/NetworkMonitor hooks and C++ wrappers.

ppapi/proxy/resource_creation_proxy.cc

Index: ppapi/proxy/resource_creation_proxy.cc
diff --git a/ppapi/proxy/resource_creation_proxy.cc b/ppapi/proxy/resource_creation_proxy.cc
index 40a89242a045174fadf8722dd3a45426691009e7..962c9ad3c3d1a4039107ccfe5d4cd2e3c1584573 100644
--- a/ppapi/proxy/resource_creation_proxy.cc
+++ b/ppapi/proxy/resource_creation_proxy.cc
@@ -238,6 +238,14 @@ PP_Resource ResourceCreationProxy::CreateMouseInputEvent(
                                     instance, data))->GetReference();
 }
 
+PP_Resource ResourceCreationProxy::CreateNetworkMonitor(
+      PP_Instance instance,
+      PPB_NetworkMonitor_Callback callback,
+      void* user_data) {
+  NOTIMPLEMENTED();  // Not proxied yet.
+  return 0;
+}
+
 PP_Resource ResourceCreationProxy::CreateGraphics3D(
     PP_Instance instance,
     PP_Resource share_context,