Add base::UnguessableToken

mojo/common/common_custom_types.mojom

 // Copyright 2016 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.
 
 module mojo.common.mojom;
 
 [Native]
 struct FilePath;
 
 [Native]
 struct ListValue;
 
 [Native]
 struct DictionaryValue;
 
 [Native]
+struct Nonce;

[Fady Samuel, 2016/09/13 17:45:00]

Sorry just noticed. Could we please make this not [Native]? Could you please
define the high and low here and write StructTraits? Thanks!

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

Done.

I originally had StructTraits but encountered huge linking errors in the
component build, so I switched to [Native].

From looking around, it seems like a lot of the StructTraits have their
implementation in the .h file (url_gurl_struct_traits.h for instance). Is this
the proper way to go?

[Fady Samuel, 2016/09/13 20:28:44]

That's fine. If you want some of the StructTraits to live in a cc file you have
to specify it in the typemap:

https://cs.chromium.org/chromium/src/cc/ipc/compositor_frame.typemap

[tguilbert, 2016/09/13 21:11:44]

Ok, thanks for the info.

+
+[Native]
 struct Time;
 
 [Native]
 struct TimeDelta;
 
 [Native]
 struct TimeTicks;
 
 [Native]
 struct String16;
 
 // Corresponds to |base::Version| in base/version.h
 struct Version {
   array<uint32> components;
 };