Defer media playback in background tabs.

chrome/chrome_tests.gypi

 # 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': {
     'chrome_browser_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
       'browser/extensions/browsertest_util.cc',
@@ skipping 303 matching lines @@
       'browser/media/chrome_media_stream_infobar_browsertest.cc',
       'browser/media/chrome_webrtc_apprtc_browsertest.cc',
       'browser/media/chrome_webrtc_audio_quality_browsertest.cc',
       'browser/media/chrome_webrtc_browsertest.cc',
       'browser/media/chrome_webrtc_disable_encryption_flag_browsertest.cc',
       'browser/media/chrome_webrtc_getmediadevices_browsertest.cc',
       'browser/media/chrome_webrtc_perf_browsertest.cc',
       'browser/media/chrome_webrtc_simulcast_browsertest.cc',
       'browser/media/chrome_webrtc_video_quality_browsertest.cc',
       'browser/media/chrome_webrtc_webcam_browsertest.cc',
+      'browser/media/defer_background_media_browsertest.cc',
       'browser/media/encrypted_media_browsertest.cc',
       'browser/media/encrypted_media_istypesupported_browsertest.cc',
       'browser/media/media_browsertest.cc',
       'browser/media/media_browsertest.h',
       'browser/media/media_stream_devices_controller_browsertest.cc',
       'browser/media/test_license_server.cc',
       'browser/media/test_license_server.h',
       'browser/media/test_license_server_config.h',
       'browser/media/webrtc_browsertest_audio.cc',
       'browser/media/webrtc_browsertest_audio.h',
@@ skipping 3051 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
           ],
         }]
     }],
   ],  # 'conditions'
 }