Add base::UnguessableToken << operator

base/unguessable_token.h

Index: base/unguessable_token.h
diff --git a/base/unguessable_token.h b/base/unguessable_token.h
index 64b1868886f2f0d06c613efa79a1f84ceb7b3c59..db17b6df071b07cff1a2acc0a7505434f741966b 100644
--- a/base/unguessable_token.h
+++ b/base/unguessable_token.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 #include <string.h>
+#include <iosfwd>
 #include <tuple>
 
 #include "base/base_export.h"
@@ -94,6 +95,11 @@ struct UnguessableTokenHash {
   }
 };
 
+BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
+                                            const UnguessableToken& token) {
+  return out << token.ToString();

[danakj, 2016/09/19 23:41:05]

Can you put the defn in the .cc file?

[tguilbert, 2016/09/20 00:04:53]

Done.

+}
+
 }  // namespace base
 
 #endif  // BASE_UNGUESSABLE_TOKEN_H_