Enable some profile_chrome unit tests on Trybots

systrace/profile_chrome/chrome_tracing_agent.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 json
 import optparse
 import os
 import py_utils
 import re
 
 from devil.android import device_errors
 from devil.android.sdk import intent
-
 from systrace import trace_result
 from systrace import tracing_agents
 
 
 _DEFAULT_CHROME_CATEGORIES = '_DEFAULT_CHROME_CATEGORIES'
 _HEAP_PROFILE_MMAP_PROPERTY = 'heapprof.mmap'
 
 
 class ChromeTracingAgent(tracing_agents.TracingAgent):
   def __init__(self, device, package_info, ring_buffer, trace_memory=False):
@@ skipping 183 matching lines @@
     categories.append('disabled-by-default-toplevel.flow')
   if config.trace_memory:
     categories.append('disabled-by-default-memory')
   if config.trace_scheduler:
     categories.append('disabled-by-default-blink.scheduler')
     categories.append('disabled-by-default-cc.debug.scheduler')
     categories.append('disabled-by-default-renderer.scheduler')
   if config.chrome_categories:
     categories += config.chrome_categories.split(',')
   return categories