Telemetry: Add option to create a dirty profile as part of a test run

tools/telemetry/telemetry/core/profile_types.py

Index: tools/telemetry/telemetry/core/profile_types.py
diff --git a/tools/telemetry/telemetry/core/profile_types.py b/tools/telemetry/telemetry/core/profile_types.py
index 44ac38f39e7789152ed7f1042fd5af215e7b341b..e2c8e3a93b09bb3e7d034379011b1f61373eb49f 100644
--- a/tools/telemetry/telemetry/core/profile_types.py
+++ b/tools/telemetry/telemetry/core/profile_types.py
@@ -4,13 +4,18 @@
 
 import os
 
+BASE_PROFILE_TYPES = ['clean', 'default', 'dirty_small']
+
 PROFILE_TYPE_MAPPING = {
   'typical_user': 'chrome/test/data/extensions/profiles/content_scripts1',
   'power_user': 'chrome/test/data/extensions/profiles/extension_webrequest',
 }
-PROFILE_TYPES = PROFILE_TYPE_MAPPING.keys()
+PROFILE_TYPES = BASE_PROFILE_TYPES + PROFILE_TYPE_MAPPING.keys()
 
 def GetProfileDir(profile_type):
+  if profile_type in BASE_PROFILE_TYPES:
+    return None
+
   path = os.path.abspath(os.path.join(os.path.dirname(__file__),
       '..', '..', '..', '..', *PROFILE_TYPE_MAPPING[profile_type].split('/')))
   assert os.path.exists(path)