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diff --git a/chromium/extensions/common/permissions/permission_message_provider.h b/chromium/extensions/common/permissions/permission_message_provider.h
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+++ b/chromium/extensions/common/permissions/permission_message_provider.h
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+// Copyright 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 EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_PROVIDER_H_
+#define EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_PROVIDER_H_
+
+#include <vector>
+
+#include "extensions/common/manifest.h"
+#include "extensions/common/permissions/permission_message.h"
+
+namespace extensions {
+
+class PermissionIDSet;
+class PermissionSet;
+
+// The PermissionMessageProvider interprets permissions, translating them
+// into warning messages to show to the user. It also determines whether
+// a new set of permissions entails showing new warning messages.
+class PermissionMessageProvider {
+ public:
+  PermissionMessageProvider() {}
+  virtual ~PermissionMessageProvider() {}
+
+  // Return the global permission message provider.
+  static const PermissionMessageProvider* Get();
+
+  // Calculates and returns the full list of permission messages for the given
+  // |permissions|. This involves converting the given PermissionIDs into
+  // localized messages, as well as coalescing and parameterizing any messages
+  // that require the permission ID's argument in their message.
+  virtual PermissionMessages GetPermissionMessages(
+      const PermissionIDSet& permissions) const = 0;
+
+  // Returns true if |new_permissions| has a greater privilege level than
+  // |old_permissions|.
+  // Whether certain permissions are considered varies by extension type.
+  // TODO(sashab): Add an implementation of this method that uses
+  // PermissionIDSet instead, then deprecate this one.
+  virtual bool IsPrivilegeIncrease(const PermissionSet& old_permissions,
+                                   const PermissionSet& new_permissions,
+                                   Manifest::Type extension_type) const = 0;
+
+  // Given the permissions for an extension, finds the IDs of all the
+  // permissions for that extension (including API, manifest and host
+  // permissions).
+  // TODO(sashab): This uses the legacy PermissionSet type. Deprecate or rename
+  // this type, and make this take as little as is needed to work out the
+  // PermissionIDSet.
+  virtual PermissionIDSet GetAllPermissionIDs(
+      const PermissionSet& permissions,
+      Manifest::Type extension_type) const = 0;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_PROVIDER_H_