Add ParameterMirror.isInitializingFormal to dart:mirrors

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index dc05474ac7d5f774af4b2d1820f7a8b5c1735c0a..ac00c0e9438c2994d7e61f2e71411ea1b58b7d23 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -861,6 +861,9 @@ RawObject* Parser::ParseFunctionParameters(const Function& func) {
       param_descriptor.SetAt(j + kParameterMetadataOffset,
           (param[i].metadata == NULL) ? Object::null_instance() :
                                         *(param[i].metadata));
+      param_descriptor.SetAt(j + kParameterIsFieldInitializorOffset,
+                             param[i].is_field_initializer ? Bool::True() :
+                                                             Bool::False());
     }
     return param_descriptor.raw();
   } else {