Roll gsutil version to 4.15.

tools/telemetry/third_party/gsutilz/gslib/tests/util.py

Index: tools/telemetry/third_party/gsutilz/gslib/tests/util.py
diff --git a/tools/telemetry/third_party/gsutilz/gslib/tests/util.py b/tools/telemetry/third_party/gsutilz/gslib/tests/util.py
index 06da870bf8170ff8ee4b39b6ea028da57d0e795b..7b1e20438dd7cb0b4d10a67bf3d937e71c15b891 100644
--- a/tools/telemetry/third_party/gsutilz/gslib/tests/util.py
+++ b/tools/telemetry/third_party/gsutilz/gslib/tests/util.py
@@ -26,7 +26,9 @@ import unittest
 import urlparse
 
 import boto
+import crcmod
 import gslib.tests as gslib_tests
+from gslib.util import UsingCrcmodExtension
 
 if not hasattr(unittest.TestCase, 'assertIsNone'):
   # external dependency unittest2 required for Python <= 2.6
@@ -226,12 +228,12 @@ def _RevertBotoConfig(revert_list):
     boto.config.remove_section(section)
 
 
-def PerformsFileToObjectUpload(func):
-  """Decorator indicating that a test uploads from a local file to an object.
+def SequentialAndParallelTransfer(func):
+  """Decorator for tests that perform file to object transfers, or vice versa.
 
   This forces the test to run once normally, and again with special boto
   config settings that will ensure that the test follows the parallel composite
-  upload code path.
+  upload and/or sliced object download code paths.
 
   Args:
     func: Function to wrap.
@@ -244,11 +246,14 @@ def PerformsFileToObjectUpload(func):
     # Run the test normally once.
     func(*args, **kwargs)
 
-    # Try again, forcing parallel composite uploads.
-    with SetBotoConfigForTest([
-        ('GSUtil', 'parallel_composite_upload_threshold', '1'),
-        ('GSUtil', 'check_hashes', 'always')]):
-      func(*args, **kwargs)
+    if not RUN_S3_TESTS and UsingCrcmodExtension(crcmod):
+      # Try again, forcing parallel upload and sliced download.
+      with SetBotoConfigForTest([
+          ('GSUtil', 'parallel_composite_upload_threshold', '1'),
+          ('GSUtil', 'sliced_object_download_threshold', '1'),
+          ('GSUtil', 'sliced_object_download_max_components', '3'),
+          ('GSUtil', 'check_hashes', 'always')]):
+        func(*args, **kwargs)
 
   return Wrapper