Add a referrer class to be used in the browser process whenever passing around referrsr

content/content_tests.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'test_support_content',
       'type': 'static_library',
       'defines!': ['CONTENT_IMPLEMENTATION'],
@@ skipping 206 matching lines @@
         'browser/trace_subscriber_stdio_unittest.cc',
         'common/mac/attributed_string_coder_unittest.mm',
         'common/mac/font_descriptor_unittest.mm',
         'common/mac/scoped_sending_event_unittest.mm',
         'common/gpu/gpu_feature_flags_unittest.cc',
         'common/gpu/gpu_info_unittest.cc',
         'common/hi_res_timer_manager_unittest.cc',
         'common/net/url_fetcher_impl_unittest.cc',
         'common/process_watcher_unittest.cc',
         'common/property_bag_unittest.cc',
+        'common/referrer_unittest.cc',
         'common/resource_dispatcher_unittest.cc',
         'gpu/gpu_info_collector_unittest.cc',
         'gpu/gpu_info_collector_unittest_win.cc',
         'renderer/active_notification_tracker_unittest.cc',
         'renderer/gpu/input_event_filter_unittest.cc',
         'renderer/media/audio_message_filter_unittest.cc',
         'renderer/media/audio_renderer_impl_unittest.cc',
         'renderer/media/capture_video_decoder_unittest.cc',
         'renderer/media/media_stream_dispatcher_unittest.cc',
         'renderer/media/rtc_video_decoder_unittest.cc',
@@ skipping 146 matching lines @@
           ],
           'sources': [
             'common/gpu/media/omx_video_decode_accelerator_unittest.cc',
           ],
         }
       ],
     },
    ],
   ],
 }