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..443a97e7445806744201d9c2ccf4179b0760178d
--- /dev/null
+++ b/extensions/browser/preload_check.cc
@@ -0,0 +1,18 @@
+// 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 {
+
+PreloadCheck::PreloadCheck(scoped_refptr<const Extension> extension)
+    : extension_(extension) {}
+
+PreloadCheck::~PreloadCheck() {}
+
+base::string16 PreloadCheck::GetErrorMessage() const {
+  return base::string16();
+}
+
+}  // namespace extensions