Add base::UnguessableToken

ipc/ipc_message_utils.cc

Index: ipc/ipc_message_utils.cc
diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
index 60c12ab60f96f879259612c993acf89d0c749cd0..c7f4fae24f938ef08209536fa681d8cfd18a921c 100644
--- a/ipc/ipc_message_utils.cc
+++ b/ipc/ipc_message_utils.cc
@@ -9,6 +9,7 @@
 
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
+#include "base/nonce.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ -998,6 +999,30 @@ void ParamTraits<base::TimeTicks>::Log(const param_type& p, std::string* l) {
   ParamTraits<int64_t>::Log(p.ToInternalValue(), l);
 }
 
+void ParamTraits<base::Nonce>::GetSize(base::PickleSizer* sizer,
+                                       const param_type& p) {
+  sizer->AddBytes(sizeof(param_type));
+}
+
+void ParamTraits<base::Nonce>::Write(base::Pickle* m, const param_type& p) {
+  m->WriteBytes(reinterpret_cast<const char*>(&p), sizeof(param_type));
+}
+
+bool ParamTraits<base::Nonce>::Read(const base::Pickle* m,
+                                    base::PickleIterator* iter,
+                                    param_type* r) {
+  const char* data;
+  if (!iter->ReadBytes(&data, sizeof(param_type)))
+    return false;
+
+  memcpy(r, data, sizeof(param_type));

[Tom Sepez, 2016/09/13 18:20:41]

Yes, this works, but I'm less thrilled with copying over the struct than having
a public ctor and passing these over the wire as two 64s.

[tguilbert, 2016/09/13 20:20:19]

Done.

+  return true;
+}
+
+void ParamTraits<base::Nonce>::Log(const param_type& p, std::string* l) {
+  l->append(p.ToString());
+}
+
 void ParamTraits<IPC::ChannelHandle>::GetSize(base::PickleSizer* sizer,
                                               const param_type& p) {
   GetParamSize(sizer, p.name);