Add missing logging codepaths for client certificate lookup.

net/ssl/ssl_platform_key_mac.cc

 // Copyright 2015 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.
 
 #include "net/ssl/ssl_platform_key.h"
 
 #include <Security/cssm.h>
 #include <Security/SecBase.h>
 #include <Security/SecCertificate.h>
 #include <Security/SecIdentity.h>
@@ skipping 203 matching lines @@
 scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
     X509Certificate* certificate) {
   // Look up the private key.
   base::ScopedCFTypeRef<SecKeyRef> private_key(
       FetchSecKeyRefForCertificate(certificate));
   if (!private_key)
     return nullptr;
 
   const CSSM_KEY* cssm_key;
   OSStatus status = SecKeyGetCSSMKey(private_key.get(), &cssm_key);
-  if (status != noErr)
+  if (status != noErr) {
+    OSSTATUS_LOG(WARNING, status);
     return nullptr;
+  }
 
   SSLPrivateKey::Type key_type;
   size_t max_length;
   if (!GetClientCertInfo(certificate, &key_type, &max_length))
     return nullptr;
 
   return make_scoped_refptr(new ThreadedSSLPrivateKey(
       base::MakeUnique<SSLPlatformKeyMac>(key_type, max_length,
                                           private_key.get(), cssm_key),
       GetSSLPlatformKeyTaskRunner()));
 }
 
 #pragma clang diagnostic pop  // "-Wdeprecated-declarations"
 
 }  // namespace net