Update gpu_tests to use cloud_storage from catapult.

content/test/gpu/gpu_tests/__init__.py

 # Copyright (c) 2012 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.
 """A library for Chrome GPU test code."""
 import os
 import sys
 
 def Init():
-  telemetry_path = os.path.join(
-    os.path.dirname(__file__),
-    '..', '..', '..', '..', 'tools', 'telemetry')
-  absolute_telemetry_path = os.path.abspath(telemetry_path)
-  sys.path.append(absolute_telemetry_path)
+  chromium_src_dir = os.path.abspath(os.path.join(
+    os.path.dirname(__file__), '..', '..', '..', '..'))
+
+  telemetry_path = os.path.join(chromium_src_dir, 'tools', 'telemetry')
+  if telemetry_path not in sys.path:
+    sys.path.append(telemetry_path)
+
+  catapult_base_path = os.path.join(
+      chromium_src_dir, 'third_party', 'catapult', 'catapult_base')
+  if catapult_base_path not in sys.path:
+    sys.path.append(catapult_base_path)
 
 Init()