Enable WebContents elevation for managed users.

chrome/browser/managed_mode/scoped_extension_elevation.h

+// Copyright (c) 2013 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_MANAGED_MODE_SCOPED_EXTENSION_ELEVATION_H_
+#define CHROME_BROWSER_MANAGED_MODE_SCOPED_EXTENSION_ELEVATION_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+
+class ManagedUserService;
+
+// Used to allow managed users to install extensions if they are currently in
+// elevated state.
+class ScopedExtensionElevation {
+ public:
+  explicit ScopedExtensionElevation(ManagedUserService* service);
+  ~ScopedExtensionElevation();
+
+  // Add elevation for the extension with the id |extension_id|.
+  void AddExtension(const std::string& extension_id);
+
+ private:
+  ManagedUserService* service_;
+
+  // A list of extensions which stay elevated until the destructor of this
+  // class is called.
+  std::vector<std::string> elevated_extensions_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedExtensionElevation);
+};
+
+#endif  // CHROME_BROWSER_MANAGED_MODE_SCOPED_EXTENSION_ELEVATION_H_