Implement crypto signature verification routines using OpenSSL.

extensions/extensions.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 1231 matching lines @@
         'test/extensions_unittests_main.cc',
       ],
       # Disable c4267 warnings until we fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
       'conditions': [
         ['OS=="win" and win_use_allocator_shim==1', {
           'dependencies': [
             '../base/allocator/allocator.gyp:allocator',
           ],
         }],
+        ['use_openssl==1', {
+          'sources': [
+            'browser/api/cast_channel/cast_auth_util_openssl_unittest.cc',
+          ]
+        }],
       ],
     },
   ]
 }