google_apis: Add a test for uploading a large file

chrome/browser/google_apis/gdata_wapi_operations.h

Index: chrome/browser/google_apis/gdata_wapi_operations.h
diff --git a/chrome/browser/google_apis/gdata_wapi_operations.h b/chrome/browser/google_apis/gdata_wapi_operations.h
index 94c77baea5d7d425455733c589a96987c80ad53c..8b12f93ccd43046d131d462bcced1c389981412b 100644
--- a/chrome/browser/google_apis/gdata_wapi_operations.h
+++ b/chrome/browser/google_apis/gdata_wapi_operations.h
@@ -445,6 +445,9 @@ struct ResumeUploadResponse {
   ~ResumeUploadResponse();
 
   GDataErrorCode code;
+  // The values of "Range" header returned from the server. The values are
+  // used to continue uploading more data. These are set to -1 if an upload
+  // is complete.
   int64 start_range_received;
   int64 end_range_received;  // inclusive. See below.
 };