[Cleanup] List trace categories through script as shown by trace record dialog

tools/profile_chrome/chrome_controller.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 os
 import re
 import time
 
 from profile_chrome import controllers
@@ skipping 29 matching lines @@
   def GetCategories(device, package_info):
     device.BroadcastIntent(intent.Intent(
         action='%s.GPU_PROFILER_LIST_CATEGORIES' % package_info.package))
     try:
       json_category_list = device.old_interface.WaitForLogMatch(
           re.compile(r'{"traceCategoriesList(.*)'), None, timeout=5).group(0)
     except pexpect.TIMEOUT:
       raise RuntimeError('Performance trace category list marker not found. '
                          'Is the correct version of the browser running?')
 
     record_categories = []

[Sami, 2014/11/07 18:58:14]

Could you turn both of these lists into sets please? That would simplify the
logic below since we wouldn't need to check for duplicates.

[r.kasibhatla, 2014/11/10 06:42:17]

Done.

     disabled_by_default_categories = []
     json_data = json.loads(json_category_list)['traceCategoriesList']
     for item in json_data:
-      if item.startswith('disabled-by-default'):
-        disabled_by_default_categories.append(item)
-      else:
-        record_categories.append(item)
+      for category in item.split(','):
+        if category.startswith('disabled-by-default'):
+          if category not in disabled_by_default_categories:
+            disabled_by_default_categories.append(category)
+        elif category not in record_categories:
+          record_categories.append(category)
 
     return record_categories, disabled_by_default_categories
 
   def StartTracing(self, interval):
     self._trace_interval = interval
     self._device.old_interface.SyncLogCat()
     start_extras = {'categories': ','.join(self._categories)}
     if self._ring_buffer:
       start_extras['continuous'] = None
     self._device.BroadcastIntent(intent.Intent(
@@ skipping 30 matching lines @@
       self._device.SetProp(_HEAP_PROFILE_MMAP_PROPERTY, 0)
 
   def PullTrace(self):
     # Wait a bit for the browser to finish writing the trace file.
     time.sleep(self._trace_interval / 4 + 1)
 
     trace_file = self._trace_file.replace('/storage/emulated/0/', '/sdcard/')
     host_file = os.path.join(os.path.curdir, os.path.basename(trace_file))
     self._device.PullFile(trace_file, host_file)
     return host_file