Make Print API work on Windows.

chromium_src/chrome/utility/utility_message_handler.h

@@ -0,0 +1,22 @@
+// Copyright 2013 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_UTILITY_UTILITY_MESSAGE_HANDLER_H_
+#define CHROME_UTILITY_UTILITY_MESSAGE_HANDLER_H_
+
+namespace IPC {
+class Message;
+}
+
+class UtilityMessageHandler {
+ public:
+  virtual ~UtilityMessageHandler() {}
+
+  // Called when a message is received.  Returns true iff the message was
+  // handled.
+  virtual bool OnMessageReceived(const IPC::Message& message) = 0;
+};
+
+#endif  // CHROME_UTILITY_UTILITY_MESSAGE_HANDLER_H_
+