Add additional UMA stats for remembering certificate decisions.

content/browser/ssl/ssl_policy_backend.h

Index: content/browser/ssl/ssl_policy_backend.h
diff --git a/content/browser/ssl/ssl_policy_backend.h b/content/browser/ssl/ssl_policy_backend.h
index 06ea23eccca94416ac90e5d1772d83b55f876d6e..55b68dd1a47bd04f7bf72e662cf811bd64875fdc 100644
--- a/content/browser/ssl/ssl_policy_backend.h
+++ b/content/browser/ssl/ssl_policy_backend.h
@@ -39,10 +39,13 @@ class SSLPolicyBackend {
                         const std::string& host,
                         net::CertStatus error);
 
-  // Queries whether |cert| is allowed or denied for |host|.
+  // Queries whether |cert| is allowed or denied for |host|. Returns true in
+  // |expired_previous_decision| if a user decision had been made previously but
+  // that decision has expired, otherwise false.
   net::CertPolicy::Judgment QueryPolicy(net::X509Certificate* cert,
                                         const std::string& host,
-                                        net::CertStatus error);
+                                        net::CertStatus error,
+                                        bool* expired_previous_decision);
 
  private:
   // SSL state specific for each host.