Add SecurityStateModelClient interface and implementation

chrome/browser/ssl/chrome_security_state_model_delegate.h

+// Copyright 2015 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 CHROME_BROWSER_SSL_CHROME_SECURITY_STATE_MODEL_DELEGATE_H_
+#define CHROME_BROWSER_SSL_CHROME_SECURITY_STATE_MODEL_DELEGATE_H_
+
+#include "base/macros.h"
+#include "chrome/browser/ssl/security_state_model_delegate.h"
+
+namespace content {
+class WebContents;
+}  // namespace content
+
+// Uses a WebContents to provide a SecurityStateModel with the
+// information that it needs to determine the page's security status.
+class ChromeSecurityStateModelDelegate : public SecurityStateModelDelegate {
+ public:
+  explicit ChromeSecurityStateModelDelegate(content::WebContents* web_contents);
+  ~ChromeSecurityStateModelDelegate() override;
+
+  // SecurityStateModelDelegate:
+  bool RetrieveCert(scoped_refptr<net::X509Certificate>* cert) override;
+  bool UsedKnownMITMCertificate() override;
+
+ private:
+  content::WebContents* web_contents_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeSecurityStateModelDelegate);
+};
+
+#endif  // CHROME_BROWSER_SSL_CHROME_SECURITY_STATE_MODEL_DELEGATE_H_