Add GetChangelist operation for Drive V2.

chrome/browser/chromeos/gdata/gdata_operations.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATIONS_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATIONS_H_
 
 #include <string>
 #include <vector>
 
 #include "chrome/browser/chromeos/gdata/operations_base.h"
 
 namespace gdata {
 
 //============================ GetDocumentsOperation ===========================
 
 // This class performs the operation for fetching a document list.
 class GetDocumentsOperation : public GetDataOperation {
  public:
+  // |start_changestamp| specifies the starting point of change list or 0 if
+  // all changes are necessary.
+  // |url| specifies URL for documents feed fetching operation. If empty URL is
+  // passed, the default URL is used and returns the first page of the result.
+  // When non-first page result is requested, |url| should be specified.
   GetDocumentsOperation(GDataOperationRegistry* registry,
+                        const GURL& url,
                         int start_changestamp,
                         const std::string& search_string,
                         const std::string& directory_resource_id,
                         const GetDataCallback& callback);
   virtual ~GetDocumentsOperation();
 
-  // Sets |url| for document fetching operation. This URL should be set in use
-  // case when additional 'pages' of document lists are being fetched.
-  void SetUrl(const GURL& url);
-
  protected:
   // Overridden from GetDataOperation.
   virtual GURL GetURL() const OVERRIDE;
 
  private:
   GURL override_url_;
   int start_changestamp_;
   std::string search_string_;
   std::string directory_resource_id_;
 
@@ skipping 381 matching lines @@
 
   // Callback to which the photo data is passed.
   GetDownloadDataCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GetContactPhotoOperation);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATIONS_H_