Extract permission alias info from PermissionsProvider

extensions/common/alias_provider.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_PROVIDER_H_
+#define EXTENSIONS_COMMON_ALIAS_PROVIDER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "extensions/common/alias.h"
+
+namespace extensions {
+
+// TODO(tbarzic): Consider auto-generating these from a JSON schema file
+// (similar to what is done for features).
+class AliasProvider {
+ public:
+  AliasProvider();
+  virtual ~AliasProvider();
+
+  // Returns all valid API aliases provided by |this|.
+  std::vector<Alias> GetValidApiAliases() const;
+  // Returns all valid API aliases provided by |this|.
+  std::vector<Alias> GetValidPermissionAliases() const;
+
+ protected:
+  // Returns API aliases provided by |this|. Returned list may contain invalid
+  // aliases - they will be filtered out before further usage.
+  virtual std::vector<Alias> GetApiAliases() const = 0;

[Devlin, 2016/09/29 22:03:43]

Until we use ApiAliases, I'd like to hold off on adding this functionality.

+  // Returns API aliases provided by |this|. Returned list may contain invalid
+  // aliases - they will be filtered out before further usage.
+  virtual std::vector<Alias> GetPermissionAliases() const = 0;
+
+ private:
+  // Returns |aliases| with invalid aliases filtered out.
+  std::vector<Alias> FilterOutInvalidAliases(
+      const std::vector<Alias>& aliases) const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AliasProvider);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_ALIAS_PROVIDER_H_