Preparation CL for WebRTC performance test using promise-based getStats

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/common/features.gni")
@@ skipping 1562 matching lines @@
       "../browser/media/defer_background_media_browsertest.cc",
       "../browser/media/encrypted_media_browsertest.cc",
       "../browser/media/encrypted_media_supported_types_browsertest.cc",
       "../browser/media/media_browsertest.cc",
       "../browser/media/media_browsertest.h",
       "../browser/media/test_license_server.cc",
       "../browser/media/test_license_server.h",
       "../browser/media/test_license_server_config.h",
       "../browser/media/webrtc/media_stream_devices_controller_browsertest.cc",
       "../browser/media/webrtc/media_stream_infobar_browsertest.cc",
+      "../browser/media/webrtc/test_stats_dictionary.cc",
+      "../browser/media/webrtc/test_stats_dictionary.h",
+      "../browser/media/webrtc/test_stats_dictionary_unittest.cc",
       "../browser/media/webrtc/webrtc_apprtc_browsertest.cc",
       "../browser/media/webrtc/webrtc_audio_quality_browsertest.cc",
       "../browser/media/webrtc/webrtc_browsertest.cc",
       "../browser/media/webrtc/webrtc_browsertest_audio.cc",
       "../browser/media/webrtc/webrtc_browsertest_audio.h",
       "../browser/media/webrtc/webrtc_browsertest_base.cc",
       "../browser/media/webrtc/webrtc_browsertest_base.h",
       "../browser/media/webrtc/webrtc_browsertest_common.cc",
       "../browser/media/webrtc/webrtc_browsertest_common.h",
       "../browser/media/webrtc/webrtc_browsertest_perf.cc",
@@ skipping 3540 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }