Add %TypedArray% to proto chain

test/mjsunit/harmony/sharedarraybuffer.js

Index: test/mjsunit/harmony/sharedarraybuffer.js
diff --git a/test/mjsunit/harmony/sharedarraybuffer.js b/test/mjsunit/harmony/sharedarraybuffer.js
index bac42681ab32fd1f521b976e65c96fbb79b2cd2a..d7f63a6898a758a2c538c8e18aea6688dfae0093 100644
--- a/test/mjsunit/harmony/sharedarraybuffer.js
+++ b/test/mjsunit/harmony/sharedarraybuffer.js
@@ -87,6 +87,15 @@ function MakeSharedTypedArray(constr, numElements) {
   return new constr(sab);
 }
 
+function GetPropertyDescriptor(object, field) {

[adamk, 2015/06/13 00:49:38]

Same worry here, I'd prefer not to do a prototype walk if it can be avoided.

+  var descriptor;
+  while (descriptor === undefined && object !== Object.prototype) {
+    descriptor = Object.getOwnPropertyDescriptor(object, field);
+    object = object.__proto__;
+  }
+  return descriptor;
+}
+
 function TestTypedArray(constr, elementSize, typicalElement) {
   assertSame(elementSize, constr.BYTES_PER_ELEMENT);
 
@@ -203,8 +212,7 @@ function TestTypedArray(constr, elementSize, typicalElement) {
   var a = new constr(sab, 64*elementSize, 128);
   assertEquals("[object " + constr.name + "]",
       Object.prototype.toString.call(a));
-  var desc = Object.getOwnPropertyDescriptor(
-      constr.prototype, Symbol.toStringTag);
+  var desc = GetPropertyDescriptor(constr.prototype, Symbol.toStringTag);
   assertTrue(desc.configurable);
   assertFalse(desc.enumerable);
   assertFalse(!!desc.writable);
@@ -310,17 +318,13 @@ var typedArrayConstructors = [
 
 function TestPropertyTypeChecks(constructor) {
   function CheckProperty(name) {
-    var d = Object.getOwnPropertyDescriptor(constructor.prototype, name);
+    var d = GetPropertyDescriptor(constructor.prototype, name);
     var o = {};
     assertThrows(function() {d.get.call(o);}, TypeError);
     for (var i = 0; i < typedArrayConstructors.length; i++) {
       var ctor = typedArrayConstructors[i];
       var a = MakeSharedTypedArray(ctor, 10);
-      if (ctor === constructor) {
-        d.get.call(a); // shouldn't throw
-      } else {
-        assertThrows(function() {d.get.call(a);}, TypeError);
-      }
+      d.get.call(a); // shouldn't throw on any type
     }
   }