Add IPC serialization for DictionaryValue, with unit tests.

chrome/common/ipc_message_utils.h

Index: chrome/common/ipc_message_utils.h
===================================================================
--- chrome/common/ipc_message_utils.h	(revision 16497)
+++ chrome/common/ipc_message_utils.h	(working copy)
@@ -25,6 +25,8 @@
 // Forward declarations.
 class GURL;
 class SkBitmap;
+class DictionaryValue;
+class ListValue;
 
 namespace gfx {
 class Point;
@@ -359,6 +361,22 @@
 };
 
 template <>
+struct ParamTraits<DictionaryValue> {
+  typedef DictionaryValue 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::wstring* l);
+};
+
+template <>
+struct ParamTraits<ListValue> {
+  typedef ListValue 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::wstring* l);
+};
+
+template <>
 struct ParamTraits<std::string> {
   typedef std::string param_type;
   static void Write(Message* m, const param_type& p) {