Add Certificate Transparency logs auditing

net/cert/merkle_tree_leaf.cc

Index: net/cert/merkle_tree_leaf.cc
diff --git a/net/cert/merkle_tree_leaf.cc b/net/cert/merkle_tree_leaf.cc
index 21e2814402cacc2adfb1aa90d90ec38472e1bf11..8e0bfa2bfcfc0df1ac764979679b2c3eee7a0b39 100644
--- a/net/cert/merkle_tree_leaf.cc
+++ b/net/cert/merkle_tree_leaf.cc
@@ -15,6 +15,12 @@ namespace ct {
 
 MerkleTreeLeaf::MerkleTreeLeaf() {}
 
+MerkleTreeLeaf::MerkleTreeLeaf(const MerkleTreeLeaf& other)
+    : log_id(other.log_id),
+      log_entry(other.log_entry),
+      timestamp(other.timestamp),
+      extensions(other.extensions) {}
+
 MerkleTreeLeaf::~MerkleTreeLeaf() {}
 
 bool Hash(const MerkleTreeLeaf& tree_leaf, std::string* out) {
@@ -50,6 +56,9 @@ bool GetMerkleTreeLeaf(const X509Certificate* cert,
   return true;
 }
 
+NET_EXPORT bool CompareLeaves(const MerkleTreeLeaf& lhs,
+                              const MerkleTreeLeaf& rhs);
+
 }  // namespace ct
 
 }  // namespace net