[ABANDONED] Make it possible to send unique_ptr<Value> over IPC/Mojo.

ipc/ipc_message_utils.h

Index: ipc/ipc_message_utils.h
diff --git a/ipc/ipc_message_utils.h b/ipc/ipc_message_utils.h
index 280e99c4f2df2b413fa579ed054a7e9c6124b08e..d0f4aed4c924fd592acee2d464632c1e289a54eb 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -679,6 +679,17 @@ struct IPC_EXPORT ParamTraits<base::UnguessableToken> {
 };
 
 template <>
+struct IPC_EXPORT ParamTraits<std::unique_ptr<base::Value>> {
+  typedef std::unique_ptr<base::Value> param_type;
+  static void GetSize(base::PickleSizer* sizer, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
 struct ParamTraits<std::tuple<>> {
   typedef std::tuple<> param_type;
   static void GetSize(base::PickleSizer* sizer, const param_type& p) {}