Add experiment on weak ping delay during call set up time

webrtc/webrtc_tests.gypi

 # Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 {
   'targets': [
     {
       'target_name': 'rtc_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         'base/base.gyp:rtc_base',
         'base/base_tests.gyp:rtc_base_tests_utils',
         'base/base_tests.gyp:rtc_base_tests',
         'libjingle/xmllite/xmllite.gyp:rtc_xmllite',
         'libjingle/xmpp/xmpp.gyp:rtc_xmpp',
         'p2p/p2p.gyp:rtc_p2p',
         'p2p/p2p.gyp:libstunprober',
         'rtc_p2p_unittest',
         'rtc_sound_tests',
         'rtc_xmllite_unittest',
         'rtc_xmpp_unittest',
         'sound/sound.gyp:rtc_sound',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/testing/gmock.gyp:gmock',
+        'system_wrappers/system_wrappers.gyp:field_trial_default',
       ],
       'conditions': [
         ['OS=="android"', {
           'dependencies': [
             '<(DEPTH)/testing/android/native_test.gyp:native_test_native_code',
           ],
         }],
       ],
     },
     {
@@ skipping 257 matching lines @@
             'build/isolate.gypi',
           ],
           'sources': [
             'webrtc_perf_tests.isolate',
           ],
         },
       ],
     }],
   ],
 }