Add new certificateProvider extension API.

net/ssl/client_cert_store_chromeos.h

Index: net/ssl/client_cert_store_chromeos.h
diff --git a/net/ssl/client_cert_store_chromeos.h b/net/ssl/client_cert_store_chromeos.h
index 2bc359cd9a5f3a0c251bacf4281bc90d2d52c1ed..77894ba16ed1440a9f7b9c70b9b26dff7162db2e 100644
--- a/net/ssl/client_cert_store_chromeos.h
+++ b/net/ssl/client_cert_store_chromeos.h
@@ -33,9 +33,15 @@ class NET_EXPORT ClientCertStoreChromeOS : public ClientCertStoreNSS {
         const scoped_refptr<X509Certificate>& cert) const = 0;
   };
 
+  class CertStoreDelegate {
+   public:
+    virtual void GetCertificates(CertificateList* provided_certs) = 0;
+  };
+
   // This ClientCertStore will return only client certs that pass the filter
   // |cert_filter|.
   ClientCertStoreChromeOS(
+      scoped_ptr<CertStoreDelegate> cert_store_delegate,
       scoped_ptr<CertFilter> cert_filter,
       const PasswordDelegateFactory& password_delegate_factory);
   ~ClientCertStoreChromeOS() override;