Enable H.264 video WebRTC behind run-time flag and add WebRtcBrowserTest for H.264

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 2109 matching lines @@
       'sources': [
         '<@(chrome_driver_tests_sources)',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
     {
       # Executable that runs each browser test in a new process.
       'target_name': 'browser_tests',
       'type': 'executable',
+      'includes': [
+        '../third_party/webrtc/build/common.gypi',
+      ],
       'dependencies': [
         'browser',
         'chrome_features.gyp:chrome_common_features',
         'chrome_resources.gyp:browser_tests_pak',
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
         'chrome_resources.gyp:packed_extra_resources',
         'chrome_resources.gyp:packed_resources',
         'common/extensions/api/api.gyp:chrome_api',
         'renderer',
@@ skipping 12 matching lines @@
         '../components/components.gyp:dom_distiller_test_support',
         '../components/components.gyp:guest_view_test_support',
         '../components/components.gyp:history_core_test_support',
         '../components/components.gyp:safe_browsing_db',
         '../components/components.gyp:ssl_config',
         '../components/components.gyp:test_database_manager',
         '../components/components.gyp:translate_core_common',
         '../components/components.gyp:ui_zoom_test_support',
         '../components/components_resources.gyp:components_resources',
         '../components/components_strings.gyp:components_strings',
+        '../content/content.gyp:feature_h264_with_openh264_ffmpeg',
         '../content/content_shell_and_tests.gyp:content_browser_test_base',
         '../crypto/crypto.gyp:crypto_test_support',
         '../device/bluetooth/bluetooth.gyp:device_bluetooth_mocks',
         '../device/serial/serial.gyp:device_serial_test_util',
         '../extensions/common/api/api.gyp:extensions_api',
         '../google_apis/google_apis.gyp:google_apis_test_support',
         '../media/cast/cast.gyp:cast_test_utility',
         '../media/media.gyp:media',
         '../net/net.gyp:net',
         '../net/net.gyp:net_test_support',
@@ skipping 255 matching lines @@
         ['enable_captive_portal_detection==1', {
           'sources': [ 'browser/captive_portal/captive_portal_browsertest.cc' ],
         }],
         ['enable_webrtc==0', {
           'sources!': [
             'browser/extensions/api/webrtc_audio_private/webrtc_audio_private_browsertest.cc',
             'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_apitest.cc',
             'browser/media/chrome_webrtc_browsertest.cc',
             'browser/media/chrome_webrtc_disable_encryption_flag_browsertest.cc',
             'browser/media/chrome_webrtc_getmediadevices_browsertest.cc',
-         ],
+          ],
+        }],
+        ['rtc_use_h264==1', {
+          'defines': [
+            'BUILDFLAG_RTC_USE_H264',
+          ],
         }],
         ['OS=="win"', {
           'sources': [
             '<(SHARED_INTERMEDIATE_DIR)/chrome_version/other_version.rc',
             '<(SHARED_INTERMEDIATE_DIR)/ui/resources/ui_unscaled_resources.rc',
           ],
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
           'dependencies': [
@@ skipping 1069 matching lines @@
             'browser',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
           ],
         }]
     }],
   ],  # 'conditions'
 }