Adds a VerifyAuditProof method to CTLogVerifier

net/cert/merkle_audit_proof.cc

Index: net/cert/merkle_audit_proof.cc
diff --git a/net/cert/merkle_audit_proof.cc b/net/cert/merkle_audit_proof.cc
index 675485b25890108277e604ab9b9ef05a61231305..f1829af1f3ef89f32935ed7b1853cb1f7fd1fb71 100644
--- a/net/cert/merkle_audit_proof.cc
+++ b/net/cert/merkle_audit_proof.cc
@@ -29,12 +29,13 @@ uint64_t CalculateAuditPathLength(uint64_t leaf_index, uint64_t tree_size) {
 }
 
 MerkleAuditProof::MerkleAuditProof() {}
 
 MerkleAuditProof::MerkleAuditProof(uint64_t leaf_index,
+                                   uint64_t tree_size,
                                    const std::vector<std::string>& audit_path)
-    : leaf_index(leaf_index), nodes(audit_path) {}
+    : leaf_index(leaf_index), tree_size(tree_size), nodes(audit_path) {}
 
 MerkleAuditProof::~MerkleAuditProof() {}
 
 }  // namespace ct
 }  // namespace net