Files.app: Add a drive sync error event to the fileBrowserPrivate API.

chrome/browser/chromeos/drive/file_system_observer.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_DRIVE_FILE_SYSTEM_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OBSERVER_H_
 
 #include "chrome/browser/chromeos/drive/file_errors.h"
+#include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace drive {
 
 // Interface for classes that need to observe events from classes implementing
 // FileSystemInterface.
 // All events are notified on UI thread.
 class FileSystemObserver {
  public:
   // Triggered when a content of a directory has been changed.
   // |directory_path| is a virtual directory path (/drive/...) representing
   // changed directory.
   virtual void OnDirectoryChanged(const base::FilePath& directory_path) {}
 
+  // Triggared when a specific drive error is occured.

[kinaba, 2014/01/15 02:18:25]

nit: s/is occured/occurred/ (no "is" and two "r"s)

[hashimoto, 2014/01/15 07:05:06]

nit: ditto for operation_observer.h.

[hirono, 2014/01/15 10:40:51]

Done.

+  virtual void OnDriveSyncError(file_system::DriveSyncErrorType type) {}
+
  protected:
   virtual ~FileSystemObserver() {}
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OBSERVER_H_