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

runtime/bin/io_natives.cc

Index: runtime/bin/io_natives.cc
diff --git a/runtime/bin/io_natives.cc b/runtime/bin/io_natives.cc
index 30cfb068dd1361478a93f6a207b93bc0696c99e6..8fe11218ddbb3a63538b97df5d14902889e4d941 100644
--- a/runtime/bin/io_natives.cc
+++ b/runtime/bin/io_natives.cc
@@ -50,8 +50,12 @@ namespace bin {
   V(SecureSocket_RegisterBadCertificateCallback, 2)                            \
   V(SecureSocket_RegisterHandshakeCompleteCallback, 2)                         \
   V(SecureSocket_Renegotiate, 4)                                               \
-  V(SecureSocket_InitializeLibrary, 3)                                         \
+  V(SecureSocket_InitializeLibrary, 4)                                         \
   V(SecureSocket_AddCertificate, 2)                                            \
+  V(SecureSocket_ChangeTrust, 2)                                               \
+  V(SecureSocket_ImportCertificatesWithPrivateKeys, 2)                         \
+  V(SecureSocket_GetCertificate, 1)                                            \
+  V(SecureSocket_RemoveCertificate, 1)                                         \
   V(SecureSocket_NewServicePort, 0)                                            \
   V(SecureSocket_FilterPointer, 1)                                             \
   V(ServerSocket_CreateBindListen, 5)                                          \