dart:io | Add SecureSocket.importPrivateCertificates, that reads a PKCS#12 file.

sdk/lib/_internal/lib/io_patch.dart

Index: sdk/lib/_internal/lib/io_patch.dart
diff --git a/sdk/lib/_internal/lib/io_patch.dart b/sdk/lib/_internal/lib/io_patch.dart
index 5725d1ed8fb855436219b6be9386794548923f9d..9f3943b1cacb07b42c14cc5cff3c8434fc0a9b54 100644
--- a/sdk/lib/_internal/lib/io_patch.dart
+++ b/sdk/lib/_internal/lib/io_patch.dart
@@ -277,7 +277,8 @@ patch class SecureSocket {
 
   patch static void initialize({String database,
                                 String password,
-                                bool useBuiltinRoots: true}) {
+                                bool useBuiltinRoots: true,
+                                bool readOnly: true}) {
     throw new UnsupportedError("SecureSocket.initialize");
   }
 
@@ -285,6 +286,24 @@ patch class SecureSocket {
                                               String trust) {
     throw new UnsupportedError("SecureSocket.addCertificate");
   }
+
+  patch static importCertificatesWithPrivateKeys(List<int> certificates,
+                                                 String password) {
+    throw new UnsupportedError(
+        "SecureSocket.importCertificatesWithPrivateKeys");
+  }
+
+  patch static X509Certificate getCertificate(String nickname) {
+    throw new UnsupportedError("SecureSocket.getCertificate");
+  }
+
+  patch static removeCertificate(String nickname) {
+    throw new UnsupportedError("SecureSocket.removeCertificate");
+  }
+
+  patch static X509Certificate changeTrust(String nickname, String trust) {
+    throw new UnsupportedError("SecureSocket.changeTrust");
+  }
 }
 
 patch class _SecureFilter {