Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/ast.h

Index: runtime/vm/ast.h
===================================================================
--- runtime/vm/ast.h	(revision 25822)
+++ runtime/vm/ast.h	(working copy)
@@ -1517,11 +1517,13 @@
   NativeBodyNode(intptr_t token_pos,
                  const Function& function,
                  const String& native_c_function_name,
-                 NativeFunction native_c_function)
+                 NativeFunction native_c_function,
+                 bool is_bootstrap_native)
       : AstNode(token_pos),
         function_(function),
         native_c_function_name_(native_c_function_name),
-        native_c_function_(native_c_function) {
+        native_c_function_(native_c_function),
+        is_bootstrap_native_(is_bootstrap_native) {
     ASSERT(function_.IsZoneHandle());
     ASSERT(native_c_function_ != NULL);
     ASSERT(native_c_function_name_.IsZoneHandle());
@@ -1533,6 +1535,7 @@
     return native_c_function_name_;
   }
   NativeFunction native_c_function() const { return native_c_function_; }
+  bool is_bootstrap_native() const { return is_bootstrap_native_; }
 
   virtual void VisitChildren(AstNodeVisitor* visitor) const { }
 
@@ -1542,6 +1545,7 @@
   const Function& function_;  // Native Dart function.
   const String& native_c_function_name_;
   NativeFunction native_c_function_;  // Actual non-Dart implementation.
+  const bool is_bootstrap_native_;  // Is a bootstrap native method.
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(NativeBodyNode);
 };