[Telemetry] Add file handle & trace value.

tools/telemetry/telemetry/web_perf/timeline_based_measurement_unittest.py

 # 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 os
 import unittest
 
 from telemetry import benchmark
 from telemetry.core import platform
 from telemetry.core import wpr_modes
@@ skipping 223 matching lines @@
         'SlowThreadJsRun-fast-duration',
         'SlowThreadJsRun-fast-idle_time',
         'SlowThreadJsRun-fast-incremental_marking',
         'SlowThreadJsRun-fast-incremental_marking_outside_idle',
         'SlowThreadJsRun-fast-mark_compactor',
         'SlowThreadJsRun-fast-mark_compactor_outside_idle',
         'SlowThreadJsRun-fast-scavenger',
         'SlowThreadJsRun-fast-scavenger_outside_idle',
         'SlowThreadJsRun-fast-total_garbage_collection',
         'SlowThreadJsRun-fast-total_garbage_collection_outside_idle',
+        'trace',
         ])
     if platform.GetHostPlatform().GetOSName() != 'win':
       # CPU metric is only supported non-Windows platforms.
       expected_names.add('SlowThreadJsRun-fast-cpu_time')
     self.assertEquals(
         expected_names, set(v.name for v in results.all_page_specific_values))
 
     # In interaction_enabled_page.html, the "slow" interaction executes
     # a loop with window.performance.now() to wait 200ms.
     # fast-duration measures wall time so its value should be at least 200ms.
@@ skipping 17 matching lines @@
     # Since window.performance.now() uses wall-time instead of thread time,
     # we only assert the biggest jank > 50ms here to account for the fact
     # that the browser may deschedule during the jank loop.
     v = results.FindAllPageSpecificValuesNamed(
         'JankThreadJSRun-responsive-biggest_jank_thread_time')
     self.assertGreaterEqual(v[0].value, 50)
 
     v = results.FindAllPageSpecificValuesNamed(
         'JankThreadJSRun-responsive-total_big_jank_thread_time')
     self.assertGreaterEqual(v[0].value, 50)