Refactor SecurityStateModel/Clients for simplicity and reusability.

components/security_state/content/content_utils.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_CONTENT_CONTENT_UTILS_H_
+#define COMPONENTS_SECURITY_STATE_CONTENT_CONTENT_UTILS_H_
+
+#include <memory>
+
+#include "third_party/WebKit/public/platform/WebSecurityStyle.h"
+
+namespace content {
+struct SecurityStyleExplanations;
+class WebContents;
+}  // namespace content
+
+namespace security_state {
+struct SecurityInfo;
+struct VisibleSecurityState;
+}  // namespace security_state
+
+namespace security_state {
+
+// Retrieves the visible security state that is relevant to GetSecurityInfo()
+// from the current page in |web_contents|.
+std::unique_ptr<security_state::VisibleSecurityState> GetVisibleSecurityState(
+    content::WebContents* web_contents);
+
+// Returns the SecurityStyle that should be applied to a WebContents
+// with the given |security_info|. Populates
+// |security_style_explanations| to explain why the returned
+// SecurityStyle was chosen.
+blink::WebSecurityStyle GetSecurityStyle(
+    const security_state::SecurityInfo& security_info,
+    content::SecurityStyleExplanations* security_style_explanations);
+
+}  // namespace security_state
+
+#endif  // COMPONENTS_SECURITY_STATE_CONTENT_CONTENT_UTILS_H_