drive: Use ResourceMetadataStorage from FileCache

chrome/browser/chromeos/drive/resource_metadata_storage.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_CHROMEOS_DRIVE_RESOURCE_METADATA_STORAGE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_STORAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 85 matching lines @@
     FileCacheEntry entry_;
 
     DISALLOW_COPY_AND_ASSIGN(CacheEntryIterator);
   };
 
   ResourceMetadataStorage(const base::FilePath& directory_path,
                           base::SequencedTaskRunner* blocking_task_runner);
 
   const base::FilePath& directory_path() const { return directory_path_; }
 
+  // Returns true if the DB used by this storage was opened, not created, during
+  // Initialize().
+  bool opened_existing_db() const { return opened_existing_db_; }
+
   // Destroys this object.
   void Destroy();
 
   // Initializes this object.
   bool Initialize();
 
   // Sets the largest changestamp.
   bool SetLargestChangestamp(int64 largest_changestamp);
 
   // Gets the largest changestamp.
@@ skipping 50 matching lines @@
 
   // Gets header.
   bool GetHeader(ResourceMetadataHeader* out_header);
 
   // Checks validity of the data.
   bool CheckValidity();
 
   // Path to the directory where the data is stored.
   base::FilePath directory_path_;
 
+  bool opened_existing_db_;
+
   // Entries stored in this storage.
   scoped_ptr<leveldb::DB> resource_map_;
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceMetadataStorage);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_STORAGE_H_