drive: Always use last_modified stored in ResourceEntry

chrome/browser/chromeos/drive/file_cache_unittest.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 <string>
 #include <vector>
 
 #include "base/callback_helpers.h"
@@ skipping 340 matching lines @@
   // Prepare a file.
   base::FilePath src_file;
   ASSERT_TRUE(base::CreateTemporaryFileInDir(temp_dir_.path(), &src_file));
 
   const std::string id = "id";
   ResourceEntry entry;
   entry.set_local_id(id);
   EXPECT_EQ(FILE_ERROR_OK, metadata_storage_->PutEntry(entry));
   ASSERT_EQ(FILE_ERROR_OK, cache_->Store(id, "md5", src_file,
                                          FileCache::FILE_OPERATION_COPY));
+  EXPECT_EQ(0, entry.file_info().last_modified());
 
   // Entry is not dirty nor opened.
   EXPECT_FALSE(cache_->IsOpenedForWrite(id));
   EXPECT_EQ(FILE_ERROR_OK, metadata_storage_->GetEntry(id, &entry));
   EXPECT_FALSE(entry.file_specific_info().cache_state().is_dirty());
 
   // Open (1).
   scoped_ptr<base::ScopedClosureRunner> file_closer1;
   EXPECT_EQ(FILE_ERROR_OK, cache_->OpenForWrite(id, &file_closer1));
   EXPECT_TRUE(cache_->IsOpenedForWrite(id));
 
   // Entry is dirty.
   EXPECT_EQ(FILE_ERROR_OK, metadata_storage_->GetEntry(id, &entry));
   EXPECT_TRUE(entry.file_specific_info().cache_state().is_dirty());
 
   // Open (2).
   scoped_ptr<base::ScopedClosureRunner> file_closer2;
   EXPECT_EQ(FILE_ERROR_OK, cache_->OpenForWrite(id, &file_closer2));
   EXPECT_TRUE(cache_->IsOpenedForWrite(id));
 
   // Close (1).
   file_closer1.reset();
   EXPECT_TRUE(cache_->IsOpenedForWrite(id));
 
+  // last_modified is updated.
+  EXPECT_EQ(FILE_ERROR_OK, metadata_storage_->GetEntry(id, &entry));
+  EXPECT_NE(0, entry.file_info().last_modified());
+
   // Close (2).
   file_closer2.reset();
   EXPECT_FALSE(cache_->IsOpenedForWrite(id));
 
   // Try to open non-existent file.
   EXPECT_EQ(FILE_ERROR_NOT_FOUND,
             cache_->OpenForWrite("nonexistent_id", &file_closer1));
 }
 
 TEST_F(FileCacheTest, UpdateMd5) {
@@ skipping 147 matching lines @@
 
   // Clear cache.
   EXPECT_TRUE(cache_->ClearAll());
 
   // Verify that the cache is removed.
   EXPECT_TRUE(base::IsDirectoryEmpty(cache_files_dir_));
 }
 
 }  // namespace internal
 }  // namespace drive