Add SecurityStateModelClient interface and implementation

chrome/browser/ssl/chrome_security_state_model_delegate.cc

+// 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.
+
+#include "chrome/browser/ssl/chrome_security_state_model_delegate.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "base/metrics/histogram_macros.h"
+#include "chrome/browser/chromeos/policy/policy_cert_service.h"
+#include "chrome/browser/chromeos/policy/policy_cert_service_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/cert_store.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/ssl_status.h"
+#include "net/cert/x509_certificate.h"
+
+ChromeSecurityStateModelDelegate::ChromeSecurityStateModelDelegate(
+    content::WebContents* web_contents)
+    : web_contents_(web_contents) {}
+
+ChromeSecurityStateModelDelegate::~ChromeSecurityStateModelDelegate() {}
+
+bool ChromeSecurityStateModelDelegate::RetrieveCert(
+    scoped_refptr<net::X509Certificate>* cert) {
+  content::NavigationEntry* entry =
+      web_contents_->GetController().GetVisibleEntry();
+  if (!entry)
+    return false;
+  return content::CertStore::GetInstance()->RetrieveCert(
+      entry->GetSSL().cert_id, cert);
+}
+
+bool ChromeSecurityStateModelDelegate::UsedKnownMITMCertificate() {
+#if defined(OS_CHROMEOS)
+  // Report if there is a policy cert first, before reporting any other
+  // authenticated-but-with-errors cases. A policy cert is a strong
+  // indicator of a MITM being present (the enterprise), while the
+  // other authenticated-but-with-errors indicate something may
+  // be wrong, or may be wrong in the future, but is unclear now.
+  policy::PolicyCertService* service =
+      policy::PolicyCertServiceFactory::GetForProfile(
+          Profile::FromBrowserContext(web_contents_->GetBrowserContext()));
+  if (service && service->UsedPolicyCertificates())
+    return true;
+#endif
+  return false;
+}