Add C++ wrappers for output parameters.

ppapi/examples/gamepad/gamepad.cc

 // 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.
 
 #include <cmath>
 #include <stdarg.h>
 #include <stdio.h>
 
 #include "ppapi/c/dev/ppb_console_dev.h"
 #include "ppapi/c/ppb_gamepad.h"
@@ skipping 60 matching lines @@
   void OnFlush(int32_t) {
     Paint();
   }
 
  private:
   void Paint() {
     pp::ImageData image = PaintImage(device_context_.size());
     if (!image.is_null()) {
       device_context_.ReplaceContents(&image);
       device_context_.Flush(
-          callback_factory_.NewRequiredCallback(&MyInstance::OnFlush));
+          callback_factory_.NewCallback(&MyInstance::OnFlush));
     } else {
       printf("NullImage\n");
     }
   }
 
   pp::ImageData PaintImage(const pp::Size& size) {
     pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, false);
     if (image.is_null())
       return image;
 
@@ skipping 49 matching lines @@
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp