Adds a function for encoding a Merkle tree leaf in TLS wire format.

net/cert/signed_certificate_timestamp.h

 // Copyright 2013 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.
 
 #ifndef NET_CERT_SIGNED_CERTIFICATE_TIMESTAMP_H_
 #define NET_CERT_SIGNED_CERTIFICATE_TIMESTAMP_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 75 matching lines @@
     : public base::RefCountedThreadSafe<SignedCertificateTimestamp> {
   // Predicate functor used in maps when SignedCertificateTimestamp is used as
   // the key.
   struct NET_EXPORT LessThan {
     bool operator()(const scoped_refptr<SignedCertificateTimestamp>& lhs,
                     const scoped_refptr<SignedCertificateTimestamp>& rhs) const;
   };
 
   // Version enum in RFC 6962, Section 3.2.
   enum Version {
+    // TODO(robpercival): Fix inconsistent naming between this and

[Eran Messeri, 2016/05/05 15:59:33]

Not convinced about the value of this TODO - if it's a simple fix as suggested,
simply do it in a follow-up CL, if not, please expand the description of this
TODO to indicate what exactly you'd want to fix. 

[Rob Percival, 2016/05/05 17:31:43]

Done in https://codereview.chromium.org/1951233003.

+    // SignedTreeHead::Version.
     SCT_VERSION_1 = 0,
   };
 
   // Source of the SCT - supplementary, not defined in CT RFC.
   // Note: The numeric values are used within histograms and should not change
   // or be re-assigned.
   enum Origin {
     SCT_EMBEDDED = 0,
     SCT_FROM_TLS_EXTENSION = 1,
     SCT_FROM_OCSP_RESPONSE = 2,
@@ skipping 24 matching lines @@
   ~SignedCertificateTimestamp();
 
   DISALLOW_COPY_AND_ASSIGN(SignedCertificateTimestamp);
 };
 
 }  // namespace ct
 
 }  // namespace net
 
 #endif  // NET_CERT_SIGNED_CERTIFICATE_TIMESTAMP_H_