drive: FileCache::Store marks the entry as dirty if empty MD5 is given

chrome/browser/chromeos/drive/file_cache.cc

 // 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.
 
 #include "chrome/browser/chromeos/drive/file_cache.h"
 
 #include <vector>
 
 #include "base/callback_helpers.h"
 #include "base/file_util.h"
@@ skipping 163 matching lines @@
     LOG(ERROR) << "Failed to store: "
                << "source_path = " << source_path.value() << ", "
                << "dest_path = " << dest_path.value() << ", "
                << "file_operation_type = " << file_operation_type;
     return FILE_ERROR_FAILED;
   }
 
   // Now that file operations have completed, update metadata.
   cache_entry.set_md5(md5);
   cache_entry.set_is_present(true);
-  cache_entry.set_is_dirty(false);
+  if (md5.empty())
+    cache_entry.set_is_dirty(true);
   return storage_->PutCacheEntry(id, cache_entry) ?
       FILE_ERROR_OK : FILE_ERROR_FAILED;
 }
 
 FileError FileCache::Pin(const std::string& id) {
   AssertOnSequencedWorkerPool();
 
   FileCacheEntry cache_entry;
   storage_->GetCacheEntry(id, &cache_entry);
   cache_entry.set_is_pinned(true);
@@ skipping 375 matching lines @@
     return;
 
   DCHECK_LT(0, it->second);
   --it->second;
   if (it->second == 0)
     write_opened_files_.erase(it);
 }
 
 }  // namespace internal
 }  // namespace drive