Implement onEvent callback framework for UDP

chrome/browser/extensions/api/socket/socket_api.h

 // Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_API_SOCKET_SOCKET_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SOCKET_SOCKET_API_H_
 #pragma once
 
 #include "chrome/browser/extensions/extension_function.h"
 
@@ skipping 27 matching lines @@
   void RespondOnUIThread();
 };
 
 // Many of these socket functions are synchronous in the sense that
 // they don't involve blocking operations, but we've made them all
 // AsyncExtensionFunctions because the underlying UDPClientSocket
 // library wants all operations to happen on the same thread as the
 // one that created the socket. Too bad.
 
 class SocketCreateFunction : public SocketApiFunction {
+ public:
+  SocketCreateFunction();
+
  protected:
   virtual bool Prepare() OVERRIDE;
   virtual void Work() OVERRIDE;
   virtual bool Respond() OVERRIDE;
 
+ private:
+  int src_id_;
+
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.socket.create")
 };
 
 class SocketDestroyFunction : public SocketApiFunction {
  protected:
   virtual bool Prepare() OVERRIDE;
   virtual void Work() OVERRIDE;
   virtual bool Respond() OVERRIDE;
 
  private:
@@ skipping 37 matching lines @@
  private:
   int socket_id_;
   std::string message_;
 
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.socket.write")
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SOCKET_SOCKET_API_H_