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

tools/profile_chrome/chrome_controller.py

Index: tools/profile_chrome/chrome_controller.py
diff --git a/tools/profile_chrome/chrome_controller.py b/tools/profile_chrome/chrome_controller.py
index 91c2504a54c4e34583644db055ad6cd543dd6fb7..b5c911f41b8f003a0a9b53e1c38d66fd980cdd65 100644
--- a/tools/profile_chrome/chrome_controller.py
+++ b/tools/profile_chrome/chrome_controller.py
@@ -51,10 +51,12 @@ class ChromeTracingController(controllers.BaseController):
     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