chromeos: Use WriteBatch to update DriveResourceMetadata DB

chrome/browser/chromeos/drive/drive_resource_metadata_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/drive_resource_metadata.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 691 matching lines @@
   scoped_ptr<DriveEntryProto> entry_proto;
 
   // Get file9.
   entry_proto = GetEntryInfoByPathSync(
       base::FilePath::FromUTF8Unsafe("drive/root/dir1/dir3/file9"));
   ASSERT_TRUE(entry_proto.get());
   EXPECT_EQ("file9", entry_proto->base_name());
   ASSERT_TRUE(!entry_proto->file_info().is_directory());
   EXPECT_EQ("md5:file9", entry_proto->file_specific_info().file_md5());
 
-  // Rename it and change the file size.
+  // Rename it.
   DriveEntryProto file_entry_proto(*entry_proto);
-  const std::string updated_md5("md5:updated");
-  file_entry_proto.mutable_file_specific_info()->set_file_md5(updated_md5);
   file_entry_proto.set_title("file100");
   entry_proto.reset();
   resource_metadata_->RefreshEntry(
       file_entry_proto,
+      google_apis::test_util::CreateCopyResultCallback(
+          &error, &drive_file_path, &entry_proto));
+  google_apis::test_util::RunBlockingPoolTask();
+  EXPECT_EQ(FILE_ERROR_OK, error);
+  EXPECT_EQ(base::FilePath::FromUTF8Unsafe("drive/root/dir1/dir3/file100"),
+            drive_file_path);
+  ASSERT_TRUE(entry_proto.get());
+  EXPECT_EQ("file100", entry_proto->base_name());
+  ASSERT_TRUE(!entry_proto->file_info().is_directory());
+  EXPECT_EQ("md5:file9", entry_proto->file_specific_info().file_md5());
+
+  // Update the file md5.
+  const std::string updated_md5("md5:updated");
+  file_entry_proto = *entry_proto;
+  file_entry_proto.mutable_file_specific_info()->set_file_md5(updated_md5);
+  entry_proto.reset();
+  resource_metadata_->RefreshEntry(
+      file_entry_proto,
       google_apis::test_util::CreateCopyResultCallback(
           &error, &drive_file_path, &entry_proto));
   google_apis::test_util::RunBlockingPoolTask();
   EXPECT_EQ(FILE_ERROR_OK, error);
   EXPECT_EQ(base::FilePath::FromUTF8Unsafe("drive/root/dir1/dir3/file100"),
             drive_file_path);
   ASSERT_TRUE(entry_proto.get());
   EXPECT_EQ("file100", entry_proto->base_name());
   ASSERT_TRUE(!entry_proto->file_info().is_directory());
   EXPECT_EQ(updated_md5, entry_proto->file_specific_info().file_md5());
@@ skipping 441 matching lines @@
       base::Bind(&CountFile, &count),
       base::Bind(google_apis::test_util::CreateCopyResultCallback(&completed),
                  true));
   google_apis::test_util::RunBlockingPoolTask();
 
   EXPECT_EQ(7, count);
   EXPECT_TRUE(completed);
 }
 
 }  // namespace drive