Extract permission alias info from PermissionsProvider

extensions/common/alias.h

+// Copyright 2016 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_COMMON_ALIAS_H_
+#define EXTENSIONS_COMMON_ALIAS_H_
+
+#include <string>
+
+namespace extensions {
+
+// Information about a specific alias.

[Devlin, 2016/10/07 18:36:21]

What is an Alias?  Why do we need them/where do we use them?  (Describe in the
comments)

[tbarzic, 2016/10/07 20:41:18]

Done.

+class Alias {
+ public:
+  // |name|: The alias name.
+  // |real_name|: The real name behind alias.
+  Alias(const char* const name, const char* const real_name)
+      : name_(name), real_name_(real_name) {}
+  ~Alias() {}
+
+  const std::string& name() const { return name_; }
+  const std::string& real_name() const { return real_name_; }
+
+ private:
+  // The alias name.
+  std::string name_;

[Devlin, 2016/10/07 18:36:21]

nit: \n

[tbarzic, 2016/10/07 20:41:18]

Done.

+  // The real name behind the alias.
+  std::string real_name_;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_ALIAS_H_