Roll gsutil version to 4.15.

tools/telemetry/third_party/gsutilz/gslib/cloud_api.py

Index: tools/telemetry/third_party/gsutilz/gslib/cloud_api.py
diff --git a/tools/telemetry/third_party/gsutilz/gslib/cloud_api.py b/tools/telemetry/third_party/gsutilz/gslib/cloud_api.py
index b7af6b6eeac56ac0457c213753aa18d7878f5edb..79d592dc4b50cbdadba24128a9ed860ff43fe84e 100644
--- a/tools/telemetry/third_party/gsutilz/gslib/cloud_api.py
+++ b/tools/telemetry/third_party/gsutilz/gslib/cloud_api.py
@@ -26,7 +26,8 @@ class CloudApi(object):
   a separate instance of the gsutil Cloud API should be instantiated per-thread.
   """
 
-  def __init__(self, bucket_storage_uri_class, logger, provider=None, debug=0):
+  def __init__(self, bucket_storage_uri_class, logger, provider=None,
+               debug=0, trace_token=None):
     """Performs necessary setup for interacting with the cloud storage provider.
 
     Args:
@@ -36,11 +37,14 @@ class CloudApi(object):
       provider: Default provider prefix describing cloud storage provider to
                 connect to.
       debug: Debug level for the API implementation (0..3).
+      trace_token: Google internal trace token to pass to the API
+                   implementation (string).
     """
     self.bucket_storage_uri_class = bucket_storage_uri_class
     self.logger = logger
     self.provider = provider
     self.debug = debug
+    self.trace_token = trace_token
 
   def GetBucket(self, bucket_name, provider=None, fields=None):
     """Gets Bucket metadata.
@@ -269,12 +273,13 @@ class CloudApi(object):
       start_byte: Starting point for download (for resumable downloads and
                   range requests). Can be set to negative to request a range
                   of bytes (python equivalent of [:-3])
-      end_byte: Ending point for download (for range requests).
+      end_byte: Ending byte number, inclusive, for download (for range
+                requests). If None, download the rest of the object.
       progress_callback: Optional callback function for progress notifications.
                          Receives calls with arguments
                          (bytes_transferred, total_size).
-      serialization_data: Implementation-specific dict containing serialization
-                          information for the download.
+      serialization_data: Implementation-specific JSON string of a dict
+                          containing serialization information for the download.
       digesters: Dict of {string : digester}, where string is a name of a hash
                  algorithm, and digester is a validation digester that supports
                  update(bytes) and digest() using that algorithm.
@@ -602,6 +607,15 @@ class NotFoundException(ServiceException):
   """Exception raised when a resource is not found (404)."""
 
 
+class BucketNotFoundException(NotFoundException):
+  """Exception raised when a bucket resource is not found (404)."""
+
+  def __init__(self, reason, bucket_name, status=None, body=None):
+    super(BucketNotFoundException, self).__init__(reason, status=status,
+                                                  body=body)
+    self.bucket_name = bucket_name
+
+
 class NotEmptyException(ServiceException):
   """Exception raised when trying to delete a bucket is not empty."""