PreloadCheck class for extension pre-install checks

chrome/browser/extensions/blacklist_check.h

Index: chrome/browser/extensions/blacklist_check.h
diff --git a/chrome/browser/extensions/blacklist_check.h b/chrome/browser/extensions/blacklist_check.h
new file mode 100644
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+++ b/chrome/browser/extensions/blacklist_check.h
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+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_BLACKLIST_CHECK_H_
+#define CHROME_BROWSER_EXTENSIONS_BLACKLIST_CHECK_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "extensions/browser/blacklist_state.h"
+#include "extensions/browser/preload_check.h"
+
+namespace extensions {
+
+class Blacklist;
+class Extension;
+
+// Asynchronously checks whether the extension is blacklisted.
+class BlacklistCheck : public PreloadCheck {
+ public:
+  BlacklistCheck(Blacklist* blacklist,
+                 scoped_refptr<const Extension> extension);
+  ~BlacklistCheck() override;
+
+  // PreloadCheck:
+  void Start(ResultCallback callback) override;
+
+ private:
+  void OnBlacklistedStateRetrieved(BlacklistState blacklist_state);
+
+  Blacklist* blacklist_;
+  ResultCallback callback_;
+  base::WeakPtrFactory<BlacklistCheck> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlacklistCheck);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_BLACKLIST_CHECK_H_