Skeleton of the overall design for the database for Pver4

components/safe_browsing_db/v4_database.cc

Index: components/safe_browsing_db/v4_database.cc
diff --git a/components/safe_browsing_db/v4_database.cc b/components/safe_browsing_db/v4_database.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f451a4f6084f4c0e3df331ba2c2d3783e7be9cd7
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+++ b/components/safe_browsing_db/v4_database.cc
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+// Copyright 2016 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 "components/safe_browsing_db/v4_database.h"
+
+namespace safe_browsing {
+
+// static
+// Factory method, should be called on the Safe Browsing sequenced task runner,
+// which is also passed to the function as |db_task_runner|.
+V4Database* V4Database::Create(
+    V4DatabaseFactory* factory,
+    const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
+    bool enable_malware_list,
+    bool enable_phishing_list,
+    bool enable_unwanted_software_list) {
+  DCHECK(factory);
+  DCHECK(db_task_runner->RunsTasksOnCurrentThread());
+  if (factory) {
+    return factory->CreateV4Database(
+        db_task_runner,
+        enable_malware_list,
+        enable_phishing_list,
+        enable_unwanted_software_list);
+  } else {
+    return nullptr;
+  }
+}
+
+V4Database::~V4Database() {}
+
+}  // namespace safe_browsing