Migrate the IndexedDB backend from Blink to Chromium

content/browser/indexed_db/leveldb/leveldb_write_batch.cc

+// Copyright (c) 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.
+
+#include "content/browser/indexed_db/leveldb/leveldb_write_batch.h"
+
+#include "content/browser/indexed_db/leveldb/leveldb_slice.h"
+#include "third_party/leveldatabase/src/include/leveldb/slice.h"
+#include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
+
+namespace content {
+
+scoped_ptr<LevelDBWriteBatch> LevelDBWriteBatch::Create() {
+  return make_scoped_ptr(new LevelDBWriteBatch);
+}
+
+LevelDBWriteBatch::LevelDBWriteBatch()
+    : write_batch_(new leveldb::WriteBatch) {}
+
+LevelDBWriteBatch::~LevelDBWriteBatch() {}
+
+static leveldb::Slice MakeSlice(const LevelDBSlice& s) {
+  return leveldb::Slice(s.begin(), s.end() - s.begin());
+}
+
+void LevelDBWriteBatch::Put(const LevelDBSlice& key,
+                            const LevelDBSlice& value) {
+  write_batch_->Put(MakeSlice(key), MakeSlice(value));
+}
+
+void LevelDBWriteBatch::Remove(const LevelDBSlice& key) {
+  write_batch_->Delete(MakeSlice(key));
+}
+
+void LevelDBWriteBatch::Clear() { write_batch_->Clear(); }
+
+}  // namespace content