As the first step in an effort to improve robustness of the cloud print proxy...

chrome/common/common_param_traits.h

 // Copyright (c) 2010 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.
 
 // This file is used to define IPC::ParamTraits<> specializations for a number
 // of types so that they can be serialized over IPC.  IPC::ParamTraits<>
 // specializations for basic types (like int and std::string) and types in the
 // 'base' project can be found in ipc/ipc_message_utils.h.  This file contains
 // specializations for types that are shared by more than one child process.
 
@@ skipping 38 matching lines @@
 class Rect;
 class Size;
 }  // namespace gfx
 
 namespace net {
 class UploadData;
 }
 
 namespace printing {
 struct PageRange;
+struct PrinterCapsAndDefaults;
 }  // namespace printing
 
 namespace webkit_glue {
 struct PasswordForm;
 }  // namespace webkit_glue
 
 namespace IPC {
 
 template <>
 struct ParamTraits<SkBitmap> {
@@ skipping 258 matching lines @@
   static bool Read(const Message* m, void** iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 // Traits for base::PlatformFileError
 template <>
 struct SimilarTypeTraits<base::PlatformFileError> {
   typedef int Type;
 };
 
+template <>
+struct ParamTraits<printing::PrinterCapsAndDefaults> {
+  typedef printing::PrinterCapsAndDefaults param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_COMMON_PARAM_TRAITS_H_