Smoke test for tracing infrastructure in PyAuto

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2012 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.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 806 matching lines @@
 
   # WebRTC MediaStream tests. Requires webcam and audio device to be present on
   # the test machine.
   'WEBRTC': {
     'all': [
       'media_stream_infobar',
       'webrtc_call',
     ],
   },
 
+  # Trace event tests.
+  'TRACING': {
+    'all': [
+      'tracing.tracing_smoke_test',
+    ],
+  },
+
   # Pyauto functional tests running on coverage bots.
   'CODE_COVERAGE': {
     'all': [
       '@FULL',
     ],
     'linux': [
       # These tests fail on coverage bots. Disabling for now.
       '-test_clean_exit',
       '-about_plugins_ui',
       '-autofill',
@@ skipping 17 matching lines @@
       '-translate.TranslateTest.testBarNotVisibleOnSSLErrorPage',
       '-ntp.NTPTest.testLaunchAppFullScreen',
       '-https.SSLTest.testSSLCertOK',
       '-https.SSLTest.testSSLCertAuthorityOK',
       '-media.media_basic_playback.MediaConstrainedNetworkPerfTest.testBasicPlaybackMatrix'
       '-policy_prefs_ui.PolicyPrefsUITest.testNoUserPoliciesNoBanner',
       '-policy_prefs_ui.PolicyPrefsUITest.testToggleUserPolicyTogglesBanner',
     ],
   },
 }