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

chrome/test/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 860 matching lines @@
       "//components/captive_portal:test_support",
       "//components/dom_distiller/content/browser",
       "//components/dom_distiller/content/renderer",
       "//components/dom_distiller/core:test_support",
       "//components/guest_view/browser:test_support",
       "//components/resources",
       "//components/safe_browsing_db:test_database_manager",
       "//components/strings",
       "//components/translate/core/common",
       "//components/user_manager:test_support",
+      "//content/public/common:common_features",
       "//content/test:browsertest_base",
       "//crypto:platform",
       "//crypto:test_support",
       "//device/bluetooth:mocks",
       "//device/serial:test_support",
       "//extensions/common/api",
       "//google_apis:test_support",
       "//media",
       "//media/base:test_support",
       "//media/cast:test_support",
@@ skipping 188 matching lines @@
     }
     if (safe_browsing_mode == 1) {
       sources += rebase_path(
               chrome_tests_gypi_values.chrome_browser_tests_full_safe_browsing_sources,
               ".",
               "//chrome")
     }
     if (enable_captive_portal_detection) {
       sources += [ "../browser/captive_portal/captive_portal_browsertest.cc" ]
     }
-    if (!enable_webrtc) {
+    if (enable_webrtc) {
+      deps += [ "//content/public/common:feature_h264_with_openh264_ffmpeg" ]
+    } else {
       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",
       ]
     }
     if (enable_media_router) {
       sources += [ "../browser/ui/webui/media_router/media_router_dialog_controller_impl_browsertest.cc" ]
@@ skipping 1128 matching lines @@
 if (is_android) {
   android_library("unit_tests_java") {
     DEPRECATED_java_in_dir = "//chrome/test/android/unit_tests_apk/src"
     deps = [
       "//base:base_java",
       "//chrome/android:chrome_java",
       "//content/public/android:content_java",
     ]
   }
 }