gdrive: Get JSON feeds parsing off the UI thread.

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>
 
@@ skipping 235 matching lines @@
   virtual bool GetContentData(std::string* upload_content_type,
                               std::string* upload_content) OVERRIDE;
   virtual std::vector<std::string> GetExtraRequestHeaders() const OVERRIDE;
 
   // Overridden from GetDataOperation.
   virtual GURL GetURL() const OVERRIDE;
   virtual bool ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
 
   // Must override GetDataOperation's ParseResponse because the response is XML
   // not JSON.
-  virtual base::Value* ParseResponse(const std::string& data) OVERRIDE;
+  virtual bool ParseResponse(GDataErrorCode fetch_error_code,
+                             const std::string& data) OVERRIDE;
  private:
   std::string app_id_;
   GURL document_url_;
 
   DISALLOW_COPY_AND_ASSIGN(AuthorizeAppsOperation);
 };
 
 //======================= AddResourceToDirectoryOperation ======================
 
 // This class performs the operation for adding a document/file/directory
@@ skipping 112 matching lines @@
   ResumeUploadCallback callback_;
   ResumeUploadParams params_;
   bool last_chunk_completed_;
 
   DISALLOW_COPY_AND_ASSIGN(ResumeUploadOperation);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATIONS_H_