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

runtime/bin/secure_socket.h

Index: runtime/bin/secure_socket.h
diff --git a/runtime/bin/secure_socket.h b/runtime/bin/secure_socket.h
index 304ccd52dad4bfbf8abcf21023fce6612bf6041a..6c5f8901cc4ea118505d94f1a4674af407053d87 100644
--- a/runtime/bin/secure_socket.h
+++ b/runtime/bin/secure_socket.h
@@ -87,14 +87,17 @@ class SSLFilter {
   static void InitializeLibrary(const char* certificate_database,
                                 const char* password,
                                 bool use_builtin_root_certificates,
+                                bool read_only,
                                 bool report_duplicate_initialization = true);
   static Dart_Port GetServicePort();
   Dart_Handle callback_error;
 
+  static char* GetPassword() { return password_; }
+
  private:
   static const int kMemioBufferSize = 20 * KB;
   static bool library_initialized_;
-  static const char* password_;
+  static char* password_;
   static dart::Mutex* mutex_;  // To protect library initialization.
   static NativeService filter_service_;