Roll gsutil version to 4.15.

tools/telemetry/third_party/gsutilz/third_party/apitools/apitools/base/py/transfer.py

Index: tools/telemetry/third_party/gsutilz/third_party/apitools/apitools/base/py/transfer.py
diff --git a/tools/telemetry/third_party/gsutilz/third_party/apitools/apitools/base/py/transfer.py b/tools/telemetry/third_party/gsutilz/third_party/apitools/apitools/base/py/transfer.py
old mode 100755
new mode 100644
index 35a4774a6fb7cd49c40ad42bbfd89e5356147398..aba55ca966abf003d1f0c37f07576eff5d4ce7ca
--- a/tools/telemetry/third_party/gsutilz/third_party/apitools/apitools/base/py/transfer.py
+++ b/tools/telemetry/third_party/gsutilz/third_party/apitools/apitools/base/py/transfer.py
@@ -331,7 +331,7 @@ class Download(_Transfer):
         else:
             if start < 0:
                 start = max(0, start + self.total_size)
-            return start, self.total_size
+            return start, self.total_size - 1
 
     def __SetRangeHeader(self, request, start, end=None):
         if start < 0:
@@ -364,12 +364,24 @@ class Download(_Transfer):
 
         """
         end_byte = end
+
+        if start < 0 and not self.total_size:
+            return end_byte
+
         if use_chunks:
             alternate = start + self.chunksize - 1
-            end_byte = min(end_byte, alternate) if end_byte else alternate
+            if end_byte is not None:
+                end_byte = min(end_byte, alternate)
+            else:
+                end_byte = alternate
+
         if self.total_size:
             alternate = self.total_size - 1
-            end_byte = min(end_byte, alternate) if end_byte else alternate
+            if end_byte is not None:
+                end_byte = min(end_byte, alternate)
+            else:
+                end_byte = alternate
+
         return end_byte
 
     def __GetChunk(self, start, end, additional_headers=None):
@@ -434,22 +446,24 @@ class Download(_Transfer):
         self.EnsureInitialized()
         progress_end_normalized = False
         if self.total_size is not None:
-            progress, end = self.__NormalizeStartEnd(start, end)
+            progress, end_byte = self.__NormalizeStartEnd(start, end)
             progress_end_normalized = True
         else:
             progress = start
-        while not progress_end_normalized or progress < end:
-            end_byte = self.__ComputeEndByte(progress, end=end,
+            end_byte = end
+        while (not progress_end_normalized or end_byte is None or
+               progress <= end_byte):
+            end_byte = self.__ComputeEndByte(progress, end=end_byte,
                                              use_chunks=use_chunks)
             response = self.__GetChunk(progress, end_byte,
                                        additional_headers=additional_headers)
             if not progress_end_normalized:
                 self.__SetTotal(response.info)
-                progress, end = self.__NormalizeStartEnd(start, end)
+                progress, end_byte = self.__NormalizeStartEnd(start, end)
                 progress_end_normalized = True
             response = self.__ProcessResponse(response)
             progress += response.length
-            if not response:
+            if response.length == 0:
                 raise exceptions.TransferRetryError(
                     'Zero bytes unexpectedly returned in download response')
 
@@ -659,6 +673,8 @@ class Upload(_Transfer):
         Returns:
           None.
         """
+        if upload_config.resumable_path is None:
+            self.strategy = SIMPLE_UPLOAD
         if self.strategy is not None:
             return
         strategy = SIMPLE_UPLOAD