common/py_trace_event: fix paths in __init__

common/py_trace_event/py_trace_event/__init__.py

Index: common/py_trace_event/py_trace_event/__init__.py
diff --git a/common/py_trace_event/py_trace_event/__init__.py b/common/py_trace_event/py_trace_event/__init__.py
index 637b7c90d3197bb905dcfcacd390a60cf2cb0491..b8b6630125a2c4607676e1d4f19d341ab5234763 100644
--- a/common/py_trace_event/py_trace_event/__init__.py
+++ b/common/py_trace_event/py_trace_event/__init__.py
@@ -1,7 +1,9 @@
 # Copyright 2016 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 sys
 
-
-sys.path.append('../../../py_utils')
+SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
+PY_UTILS = os.path.abspath(os.path.join(SCRIPT_DIR, '..', '..', 'py_utils'))
+sys.path.append(PY_UTILS)