[fsp] Pass more detailed errors to the providing extension.

chrome/browser/chromeos/file_system_provider/request_manager.h

 // Copyright 2014 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_FILE_SYSTEM_PROVIDER_REQUEST_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REQUEST_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 95 matching lines @@
 
   explicit RequestManager(NotificationManagerInterface* notification_manager);
   virtual ~RequestManager();
 
   // Creates a request and returns its request id (greater than 0). Returns 0 in
   // case of an error (eg. too many requests). The |type| argument indicates
   // what kind of request it is.
   int CreateRequest(RequestType type, scoped_ptr<HandlerInterface> handler);
 
   // Handles successful response for the |request_id|. If |has_more| is false,
-  // then the request is disposed, after handling the |response|. On error,
-  // returns false, and the request is disposed. |response| must not be NULL.
-  bool FulfillRequest(int request_id,
-                      scoped_ptr<RequestValue> response,
-                      bool has_more);
+  // then the request is disposed, after handling the |response|. On success,
+  // returns base::File::FILE_OK. Otherwise returns an error code. |response|
+  // must not be NULL.
+  base::File::Error FulfillRequest(int request_id,
+                                   scoped_ptr<RequestValue> response,
+                                   bool has_more);
 
-  // Handles error response for the |request_id|. If handling the error fails,
-  // returns false. Always disposes the request. |response| must not be NULL.
-  bool RejectRequest(int request_id,
-                     scoped_ptr<RequestValue> response,
-                     base::File::Error error);
+  // Handles error response for the |request_id|. If handling the error
+  // succeeds, theen returns base::File::FILE_OK. Otherwise returns an error
+  // code. Always disposes the request. |response| must not be NULL.
+  base::File::Error RejectRequest(int request_id,
+                                  scoped_ptr<RequestValue> response,
+                                  base::File::Error error);
 
   // Sets a custom timeout for tests. The new timeout value will be applied to
   // new requests
   void SetTimeoutForTesting(const base::TimeDelta& timeout);
 
   // Gets list of active request ids.
   std::vector<int> GetActiveRequestIds() const;
 
   // Adds and removes observers.
   void AddObserver(Observer* observer);
@@ skipping 38 matching lines @@
   ObserverList<Observer> observers_;
   base::WeakPtrFactory<RequestManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RequestManager);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REQUEST_MANAGER_H_