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diff --git a/ios/web/public/security_style.h b/ios/web/public/security_style.h
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+++ b/ios/web/public/security_style.h
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+// Copyright 2014 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 IOS_WEB_PUBLIC_SECURITY_STYLE_H_
+#define IOS_WEB_PUBLIC_SECURITY_STYLE_H_
+
+namespace web {
+
+// Various aspects of the UI change their appearance according to the security
+// context in which they are displayed.  For example, the location bar displays
+// a lock icon when it is displayed during a valid SSL connection.
+// SecuritySyle enumerates these styles, but it is up to the UI elements to
+// adjust their display appropriately.
+enum SecurityStyle {
+  // SECURITY_STYLE_UNKNOWN indicates that we do not know the proper security
+  // style for this object.
+  SECURITY_STYLE_UNKNOWN,
+
+  // SECURITY_STYLE_UNAUTHENTICATED means the authenticity of this object can
+  // not be determined, either because it was retrieved using an unauthenticated
+  // protocol, such as HTTP or FTP, or it was retrieved using a protocol that
+  // supports authentication, such as HTTPS, but there were errors during
+  // transmission that render us uncertain to the object's authenticity.
+  SECURITY_STYLE_UNAUTHENTICATED,
+
+  // SECURITY_STYLE_AUTHENTICATION_BROKEN indicates that we tried to retrieve
+  // this object in an authenticated manner but were unable to do so.
+  SECURITY_STYLE_AUTHENTICATION_BROKEN,
+
+  // SECURITY_STYLE_AUTHENTICATED indicates that we successfully retrieved this
+  // object over an authenticated protocol, such as HTTPS.
+  SECURITY_STYLE_AUTHENTICATED,
+  SECURITY_STYLE_LAST = SECURITY_STYLE_AUTHENTICATED
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_SECURITY_STYLE_H_