ipc: Add ParamTraits<signed char>

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 45f424d763370538b95ac25c01c4bf24114cfc76..1e2832fcaa524d56b4677dbb264c5bf1a51b191c 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -133,6 +133,14 @@ struct ParamTraits<bool> {
 };
 
 template <>
+struct IPC_EXPORT ParamTraits<signed char> {
+  typedef signed char param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
 struct IPC_EXPORT ParamTraits<unsigned char> {
   typedef unsigned char param_type;
   static void Write(Message* m, const param_type& p);