Add browser_tests to the GN build.

media/media.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 1397 matching lines @@
         }, {  # media_use_ffmpeg==0
           'sources!': [
             'base/demuxer_perftest.cc',
             'test/pipeline_integration_perftest.cc',
             'test/pipeline_integration_test_base.cc',
           ],
         }],
       ],
     },
     {
-      # GN version: //media:test_support
+      # GN versions (it is split apart): //media:test_support,
+      # //media/base:test_support, and //media/audio:test_support
       'target_name': 'media_test_support',
       'type': 'static_library',
       'dependencies': [
         'media',
         'shared_memory_support',
         '../base/base.gyp:base',
         '../skia/skia.gyp:skia',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
       ],
@@ skipping 461 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'media_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }