Fix bug in Dart_GetTypeOfExternalTypedData.

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 cb5d584d94defbb8ce8e76e8412285428fb5cce5..e969b5088c0332c98f9133cc923018fa8fb0ce46 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -3241,10 +3241,20 @@ DART_EXPORT Dart_TypedData_Type Dart_GetTypeOfExternalTypedData(
     Dart_Handle object) {
   TRACE_API_CALL(CURRENT_FUNC);
   intptr_t class_id = Api::ClassId(object);
-  if (RawObject::IsExternalTypedDataClassId(class_id) ||
-      RawObject::IsTypedDataViewClassId(class_id)) {
+  if (RawObject::IsExternalTypedDataClassId(class_id)) {
     return GetType(class_id);
   }
+  if (RawObject::IsTypedDataViewClassId(class_id)) {
+    // Check if data object of the view is external.
+    Isolate* isolate = Isolate::Current();
+    const Instance& view_obj = Api::UnwrapInstanceHandle(isolate, object);
+    ASSERT(!view_obj.IsNull());
+    const Instance& data_obj =
+        Instance::Handle(isolate, TypedDataView::Data(view_obj));
+    if (ExternalTypedData::IsExternalTypedData(data_obj)) {
+      return GetType(class_id);
+    }
+  }
   return Dart_TypedData_kInvalid;
 }