PreloadCheck class for extension pre-install checks

extensions/browser/policy_check.h

Index: extensions/browser/policy_check.h
diff --git a/extensions/browser/policy_check.h b/extensions/browser/policy_check.h
new file mode 100644
index 0000000000000000000000000000000000000000..a8443419fc6db6e532027e61376f7fe9be3f1ceb
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+++ b/extensions/browser/policy_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 EXTENSIONS_BROWSER_POLICY_CHECK_H_
+#define EXTENSIONS_BROWSER_POLICY_CHECK_H_
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "extensions/browser/preload_check.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace extensions {
+
+class Extension;
+
+// Checks whether loading this extension is disabled by policy. Synchronously
+// calls the callback with the result.
+class PolicyCheck : public PreloadCheck {
+ public:
+  PolicyCheck(content::BrowserContext* context,
+              scoped_refptr<const Extension> extension);
+  ~PolicyCheck() override;
+
+  // PreloadCheck:
+  void Start(ResultCallback callback) override;
+  base::string16 GetErrorMessage() const override;
+
+ private:
+  content::BrowserContext* context_;
+  base::string16 error_;
+
+  DISALLOW_COPY_AND_ASSIGN(PolicyCheck);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_POLICY_CHECK_H_