Add Dart_NewIntegerFromUint64.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index f30f365fa89b1104eebb6553cabf034f6aa46e91..89d602af857135d890e2efc000a61e066ff23182 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -2031,6 +2031,14 @@ DART_EXPORT Dart_Handle Dart_NewInteger(int64_t value) {
 }
 
 
+DART_EXPORT Dart_Handle Dart_NewIntegerFromUint64(uint64_t value) {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  CHECK_CALLBACK_STATE(isolate);
+  return Api::NewHandle(isolate, Integer::NewFromUint64(value));
+}
+
+
 DART_EXPORT Dart_Handle Dart_NewIntegerFromHexCString(const char* str) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
@@ -2089,8 +2097,9 @@ DART_EXPORT Dart_Handle Dart_IntegerToUint64(Dart_Handle integer,
   if (int_obj.IsNull()) {
     RETURN_TYPE_ERROR(isolate, integer, Integer);
   }
-  ASSERT(!int_obj.IsSmi());
-  if (int_obj.IsMint() && !int_obj.IsNegative()) {
+  if (int_obj.IsSmi()) {
+    ASSERT(int_obj.IsNegative());
+  } else if (int_obj.IsMint() && !int_obj.IsNegative()) {
     *value = int_obj.AsInt64Value();
     return Api::Success();
   } else {