Parse Drive API responses all at once in the blocking pool.

google_apis/drive/base_requests.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.
 //
 // This file provides base classes used to issue HTTP requests for Google
 // APIs.
 
 #ifndef GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_
 #define GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_
 
@@ skipping 11 matching lines @@
 #include "url/gurl.h"
 
 namespace base {
 class Value;
 }  // namespace base
 
 namespace google_apis {
 
 class RequestSender;
 
-// Callback used to pass parsed JSON from ParseJson(). If parsing error occurs,
-// then the passed argument is null.
-typedef base::Callback<void(scoped_ptr<base::Value> value)> ParseJsonCallback;
-
 // Callback used for DownloadFileRequest and ResumeUploadRequestBase.
 typedef base::Callback<void(int64 progress, int64 total)> ProgressCallback;
 
 // Callback used to get the content from DownloadFileRequest.
 typedef base::Callback<void(
     GDataErrorCode error,
     scoped_ptr<std::string> content)> GetContentCallback;
 
-// Parses JSON passed in |json| on |blocking_task_runner|. Runs |callback| on
-// the calling thread when finished with either success or failure.
-// The callback must not be null.
-void ParseJson(base::TaskRunner* blocking_task_runner,
-               const std::string& json,
-               const ParseJsonCallback& callback);
+// Parses JSON passed in |json|. Returns NULL on failure.
+scoped_ptr<base::Value> ParseJson(const std::string& json);
 
 //======================= AuthenticatedRequestInterface ======================
 
 // An interface class for implementing a request which requires OAuth2
 // authentication.
 class AuthenticatedRequestInterface {
  public:
   // Called when re-authentication is required. See Start() for details.
   typedef base::Callback<void(AuthenticatedRequestInterface* request)>
       ReAuthenticateCallback;
@@ skipping 470 matching lines @@
   const ProgressCallback progress_callback_;
   const GURL download_url_;
   const base::FilePath output_file_path_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileRequestBase);
 };
 
 }  // namespace google_apis
 
 #endif  // GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_