[fsp] Allow to create multiple observers for a directory, up to one per origin.

chrome/browser/chromeos/file_system_provider/registry.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_REGISTRY_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REGISTRY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 10 matching lines @@
 namespace file_system_provider {
 
 // Key names for preferences.
 extern const char kPrefKeyFileSystemId[];
 extern const char kPrefKeyDisplayName[];
 extern const char kPrefKeyWritable[];
 extern const char kPrefKeySupportsNotifyTag[];
 extern const char kPrefKeyObservedEntries[];
 extern const char kPrefKeyObservedEntryEntryPath[];
 extern const char kPrefKeyObservedEntryRecursive[];
+extern const char kPrefKeyObservedEntryPersistentOrigins[];
 extern const char kPrefKeyObservedEntryLastTag[];
 
 class ProvidedFileSystemInfo;
 
 // Registers preferences to remember registered file systems between reboots.
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
 // Remembers and restores file systems in a persistent storage.
 class Registry : public RegistryInterface {
  public:
@@ skipping 14 matching lines @@
 
  private:
   Profile* profile_;  // Not owned.
   DISALLOW_COPY_AND_ASSIGN(Registry);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REGISTRY_H_