Add SNAPSHOT sync mode to LocalFileSyncContext::PrepareForSync

chrome/browser/sync_file_system/local/canned_syncable_file_system.h

 // Copyright 2013 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_SYNC_FILE_SYSTEM_LOCAL_CANNED_SYNCABLE_FILE_SYSTEM_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_CANNED_SYNCABLE_FILE_SYSTEM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 27 matching lines @@
 namespace net {
 class URLRequestContext;
 }
 
 namespace quota {
 class QuotaManager;
 }
 
 namespace sync_file_system {
 
+class FileChangeList;
 class LocalFileSyncContext;
 class SyncFileSystemBackend;
 
 // A canned syncable filesystem for testing.
 // This internally creates its own QuotaManager and FileSystemContext
 // (as we do so for each isolated application).
 class CannedSyncableFileSystem
     : public LocalFileSyncStatus::Observer {
  public:
   typedef base::Callback<void(base::PlatformFileError)> StatusCallback;
@@ skipping 75 matching lines @@
 
   // Purges the file system local storage.
   base::PlatformFileError DeleteFileSystem();
 
   // Retrieves the quota and usage.
   quota::QuotaStatusCode GetUsageAndQuota(int64* usage, int64* quota);
 
   // ChangeTracker related methods. They run on file task runner.
   void GetChangedURLsInTracker(fileapi::FileSystemURLSet* urls);
   void ClearChangeForURLInTracker(const fileapi::FileSystemURL& url);
+  void GetChangesForURLInTracker(const fileapi::FileSystemURL& url,
+                                 FileChangeList* changes);
 
   SyncFileSystemBackend* backend();
   fileapi::FileSystemOperationRunner* operation_runner();
 
   // LocalFileSyncStatus::Observer overrides.
   virtual void OnSyncEnabled(const fileapi::FileSystemURL& url) OVERRIDE;
   virtual void OnWriteEnabled(const fileapi::FileSystemURL& url) OVERRIDE;
 
   // Operation methods body.
   // They can be also called directly if the caller is already on IO thread.
@@ skipping 72 matching lines @@
   bool is_filesystem_opened_;
 
   scoped_refptr<ObserverList> sync_status_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedSyncableFileSystem);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_CANNED_SYNCABLE_FILE_SYSTEM_H_