[js-interop] Fix function binding and avoid noSuchMethod when using map notation

test/js/browser_tests_bootstrap.js

Index: test/js/browser_tests_bootstrap.js
diff --git a/test/js/browser_tests_bootstrap.js b/test/js/browser_tests_bootstrap.js
index 7fbf367859e019ace71cb4392f0d849d4e90519f..46fe6cf21744bcf3cc9669dfb27cf88ae079133d 100644
--- a/test/js/browser_tests_bootstrap.js
+++ b/test/js/browser_tests_bootstrap.js
@@ -20,14 +20,28 @@ function razzle() {
   return x;
 }
 
+function varArgs() {
+  var args = arguments;
+  var sum = 0;
+  for (var i = 0; i < args.length; ++i) {
+    sum += args[i];
+  }
+  return sum;
+}
+
 function Foo(a) {
   this.a = a;
 }
 
+Foo.b = 38;
+
 Foo.prototype.bar = function() {
   return this.a;
 }
 
+var container = new Object();
+container.Foo = Foo;
+
 function isArray(a) {
   return a instanceof Array;
 }