Introduce security_state::ShouldAlwaysShowIcon() for mobile omnibox calculations.

components/security_state/core/security_state_ui.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 COMPONENTS_SECURITY_STATE_SECURITY_STATE_UI_H_
+#define COMPONENTS_SECURITY_STATE_SECURITY_STATE_UI_H_
+
+#include "components/security_state/core/security_state.h"
+
+// Provides helper methods that encapsulate platform-independent security UI
+// logic.
+namespace security_state {
+
+// On some (mobile) form factors, the security indicator icon is hidden to save
+// UI space. This returns whether the icon should always be shown for the given
+// |security_level|, i.e. whether to override the hiding behaviour.
+bool ShouldAlwaysShowIcon(SecurityLevel security_level);
+
+}  // namespace security_state
+
+#endif  // COMPONENTS_SECURITY_STATE_SECURITY_STATE_UI_H_