Invoke native methods directly

pkg/analyzer/lib/src/summary/summarize_ast.dart

Index: pkg/analyzer/lib/src/summary/summarize_ast.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_ast.dart b/pkg/analyzer/lib/src/summary/summarize_ast.dart
index e60e9d9e5935d33bcb39a4aa014b7b10a6482ab2..0d5106f3350c81e2304505a35ce73500de974e37 100644
--- a/pkg/analyzer/lib/src/summary/summarize_ast.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_ast.dart
@@ -1108,7 +1108,7 @@ class _SummarizeAstVisitor extends RecursiveAstVisitor {
       b.isConst = true;
       b.constCycleSlot = assignSlot();
     }
-    b.isExternal = node.externalKeyword != null;
+    b.isExternal = node.externalKeyword != null || node.body is NativeFunctionBody;
     b.documentationComment = serializeDocumentation(node.documentationComment);
     b.annotations = serializeAnnotations(node.metadata);
     b.codeRange = serializeCodeRange(node);
@@ -1230,7 +1230,7 @@ class _SummarizeAstVisitor extends RecursiveAstVisitor {
         node.documentationComment,
         node.metadata,
         node.functionExpression.typeParameters,
-        node.externalKeyword != null,
+        node.externalKeyword != null || node.functionExpression.body is NativeFunctionBody,
         false,
         node.parent is FunctionDeclarationStatement));
   }
@@ -1357,7 +1357,7 @@ class _SummarizeAstVisitor extends RecursiveAstVisitor {
         node.documentationComment,
         node.metadata,
         node.typeParameters,
-        node.externalKeyword != null,
+        node.externalKeyword != null || node.body is NativeFunctionBody,
         false,
         false));
   }