PreloadCheck class for extension pre-install checks

extensions/browser/preload_check.cc

Index: extensions/browser/preload_check.cc
diff --git a/extensions/browser/preload_check.cc b/extensions/browser/preload_check.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d30e38ddf29310b288e5aca7ea880c0917ce5ea0
--- /dev/null
+++ b/extensions/browser/preload_check.cc
@@ -0,0 +1,13 @@
+// Copyright 2017 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 "extensions/browser/preload_check.h"
+
+namespace extensions {
+
+bool PreloadCheck::GetErrorMessage(base::string16* error) const {
+  return false;
+}
+
+}  // namespace extensions