drive: Add ResourceMetadataStorage::Iterator::GetCacheEntry()

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 33 matching lines @@
     explicit Iterator(scoped_ptr<leveldb::Iterator> it);
     ~Iterator();
 
     // Returns true if this iterator cannot advance any more and does not point
     // to a valid entry. Get() and Advance() should not be called in such cases.
     bool IsAtEnd() const;
 
     // Returns the entry currently pointed by this object.
     const ResourceEntry& Get() const;
 
+    // Gets the cache entry which corresponds to |entry_| if available.
+    bool GetCacheEntry(FileCacheEntry* cache_entry);
+
     // Advances to the next entry.
     void Advance();
 
     // Returns true if this object has encountered any error.
     bool HasError() const;
 
    private:
     ResourceEntry entry_;
     scoped_ptr<leveldb::Iterator> it_;
 
@@ skipping 120 matching lines @@
 
   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_