Object.observe: generate change records for indexed properties.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 37d0ab7983dd97c3319f3c9ca59b310e6ef16f13..67949d8aced3dd2adf7ea9dde2295c0bbd433c23 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5084,6 +5084,11 @@ PropertyAttributes JSReceiver::GetPropertyAttribute(String* key) {
 }
 
 
+PropertyAttributes JSReceiver::GetElementAttribute(uint32_t index) {
+  return GetElementAttributeWithReceiver(this, index);
+}
+
+
 // TODO(504): this may be useful in other places too where JSGlobalProxy
 // is used.
 Object* JSObject::BypassGlobalProxy() {
@@ -5112,6 +5117,22 @@ bool JSReceiver::HasElement(uint32_t index) {
 }
 
 
+bool JSReceiver::HasLocalElement(uint32_t index) {
+  if (IsJSProxy()) {
+    return JSProxy::cast(this)->HasElementWithHandler(index);
+  }
+  return JSObject::cast(this)->HasLocalElement(index);
+}
+
+
+PropertyAttributes JSReceiver::GetLocalElementAttribute(uint32_t index) {
+  if (IsJSProxy()) {
+    return JSProxy::cast(this)->GetElementAttributeWithHandler(this, index);
+  }
+  return JSObject::cast(this)->GetLocalElementAttribute(index);
+}
+
+
 bool AccessorInfo::all_can_read() {
   return BooleanBit::get(flag(), kAllCanReadBit);
 }