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")
 import("//chrome/test/base/js2gtest.gni")
 import("//testing/test.gni")
+import("//third_party/webrtc/build/webrtc.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 # This target exists to reference other test executables to bring these files
 # into the build.
 group("test") {
   testonly = true
 }
@@ skipping 1056 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 (rtc_use_h264) {
+      defines += [ "BUILDFLAG_RTC_USE_H264" ]
+    }
     if (enable_media_router) {
       sources += [ "../browser/ui/webui/media_router/media_router_dialog_controller_impl_browsertest.cc" ]
       deps += [ "//chrome/test/media_router:media_router_browsertests" ]
     }
     if (is_win) {
       deps += [
         "//chrome:other_version",
         "//third_party/wtl",
         "//ui/resources",
       ]
@@ skipping 1120 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",
     ]
   }
 }