gdrive: Get JSON feeds parsing off the UI thread.

chrome/browser/chromeos/gdata/operations_base.h

Index: chrome/browser/chromeos/gdata/operations_base.h
diff --git a/chrome/browser/chromeos/gdata/operations_base.h b/chrome/browser/chromeos/gdata/operations_base.h
index cf8ee2c78eda275d794106450fff89f24c057c60..c0767647503c68fe1b8ae9b2914463cb1daab723 100644
--- a/chrome/browser/chromeos/gdata/operations_base.h
+++ b/chrome/browser/chromeos/gdata/operations_base.h
@@ -28,7 +28,7 @@ class AuthOperation : public GDataOperationRegistry::Operation,
  public:
   AuthOperation(GDataOperationRegistry* registry,
                 Profile* profile,
-                const AuthStatusCallback& callback,
+const AuthStatusCallback& callback,
                 const std::string& refresh_token);
   virtual ~AuthOperation();
   void Start();
@@ -185,15 +185,24 @@ class GetDataOperation : public UrlFetchOperationBase {
   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);
 };