Adds SecurityContext.usePrivateKeyBytes

runtime/bin/secure_socket_patch.dart

Index: runtime/bin/secure_socket_patch.dart
diff --git a/runtime/bin/secure_socket_patch.dart b/runtime/bin/secure_socket_patch.dart
index 8d0b6bc39c3eb2540a800c295d6343a14f4b87ca..108215838683036fc51ea43a22dc676bf48e5485 100644
--- a/runtime/bin/secure_socket_patch.dart
+++ b/runtime/bin/secure_socket_patch.dart
@@ -137,8 +137,13 @@ class _SecurityContext
   static final SecurityContext defaultContext =
       new _SecurityContext().._trustBuiltinRoots();
 
-  void usePrivateKey(String keyFile, {String password})
-      native "SecurityContext_UsePrivateKey";
+  Future usePrivateKey(String keyFile, {String password}) {
+    return (new File(keyFile)).readAsBytes().then((bytes) {
+      usePrivateKeyAsBytes(bytes, password: password);
+    });
+  }
+  void usePrivateKeyAsBytes(List<int> keyBytes, {String password})
+      native "SecurityContext_UsePrivateKeyAsBytes";
   void setTrustedCertificates({String file, String directory})
       native "SecurityContext_SetTrustedCertificates";
   void useCertificateChain(String file)
@@ -178,4 +183,4 @@ class _X509CertificateImpl extends NativeFieldWrapperClass1
   }
   int _startValidity() native "X509_StartValidity";
   int _endValidity() native "X509_EndValidity";
-}
+}