Add Net.CertVerifier_First_Job_Latency metric.

net/cert/multi_threaded_cert_verifier.h

 // Copyright (c) 2012 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_MULTI_THREADED_CERT_VERIFIER_H_
 #define NET_CERT_MULTI_THREADED_CERT_VERIFIER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 135 matching lines @@
   uint64 requests() const { return requests_; }
   uint64 inflight_joins() const { return inflight_joins_; }
 
   // cache_ maps from a request to a cached result.
   CertVerifierCache cache_;
 
   // inflight_ maps from a request to an active verification which is taking
   // place.
   std::map<RequestParams, CertVerifierJob*> inflight_;
 
+  // A non-owning pointer to the first job for histogramming.
+  CertVerifierJob* first_job_;
+
   uint64 requests_;
   uint64 cache_hits_;
   uint64 inflight_joins_;
 
   scoped_refptr<CertVerifyProc> verify_proc_;
 
   CertTrustAnchorProvider* trust_anchor_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(MultiThreadedCertVerifier);
 };
 
 }  // namespace net
 
 #endif  // NET_CERT_MULTI_THREADED_CERT_VERIFIER_H_