gdrive: Get JSON feeds parsing off the UI thread.

chrome/browser/chromeos/gdata/operations_base.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_OPERATIONS_BASE_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_OPERATIONS_BASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 10 matching lines @@
 namespace gdata {
 
 //================================ AuthOperation ===============================
 
 // OAuth2 authorization token retrieval operation.
 class AuthOperation : public GDataOperationRegistry::Operation,
                       public OAuth2AccessTokenConsumer {
  public:
   AuthOperation(GDataOperationRegistry* registry,
                 Profile* profile,
-                const AuthStatusCallback& callback,
+const AuthStatusCallback& callback,

[hashimoto, 2012/07/19 03:57:57]

nit: Fix indent

[yoshiki, 2012/07/19 04:58:45]

Done.

                 const std::string& refresh_token);
   virtual ~AuthOperation();
   void Start();
 
   // Overridden from OAuth2AccessTokenConsumer:
   virtual void OnGetTokenSuccess(const std::string& access_token) OVERRIDE;
   virtual void OnGetTokenFailure(const GoogleServiceAuthError& error) OVERRIDE;
 
   // Overridden from GDataOpertionRegistry::Operation
   virtual void DoCancel() OVERRIDE;
@@ skipping 136 matching lines @@
 
 // This class performs the operation for fetching and parsing JSON data content.
 class GetDataOperation : public UrlFetchOperationBase {
  public:
   GetDataOperation(GDataOperationRegistry* registry,
                    Profile* profile,
                    const GetDataCallback& callback);
   virtual ~GetDataOperation();
 
   // Parse GData JSON response.
-  virtual base::Value* ParseResponse(const std::string& data);
+  virtual bool ParseResponse(GDataErrorCode fetch_error_code,
+                             const std::string& data);
 
  protected:
   // Overridden from UrlFetchOperationBase.
   virtual bool ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
-  virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) OVERRIDE;
+  virtual void RunCallbackOnPrematureFailure(
+      GDataErrorCode fetch_error_code) OVERRIDE;
+  void RunCallback(GDataErrorCode fetch_error_code,
+                   scoped_ptr<base::Value> value);
 
  private:
+  void OnDataParsed(GDataErrorCode fetch_error_code,
+                    scoped_ptr<base::Value>* value);
+
   GetDataCallback callback_;
+  base::WeakPtrFactory<GetDataOperation> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(GetDataOperation);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_OPERATIONS_BASE_H_