Add SecurityStateModelClient interface and implementation

chrome/browser/ssl/security_state_model_client.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_SECURITY_STATE_MODEL_CLIENT_H_
+#define CHROME_BROWSER_SSL_SECURITY_STATE_MODEL_CLIENT_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+
+namespace net {
+class X509Certificate;
+}  // namespace net
+
+// Provides embedder-specific information that a SecurityStateModel
+// needs to determine the page's security status.
+class SecurityStateModelClient {
+ public:
+  SecurityStateModelClient() {}
+  virtual ~SecurityStateModelClient() {}
+
+  // Returns the certificate used to load the page or request.
+  virtual bool RetrieveCert(scoped_refptr<net::X509Certificate>* cert) = 0;
+
+  // Returns true if the page or request is known to be loaded with a
+  // certificate installed by the system administrator.
+  virtual bool UsedPolicyInstalledCertificate() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SecurityStateModelClient);
+};
+
+#endif  // CHROME_BROWSER_SSL_SECURITY_STATE_MODEL_CLIENT_H_