Add support for DateTimeFormat.formatToParts

src/js/i18n.js

Index: src/js/i18n.js
diff --git a/src/js/i18n.js b/src/js/i18n.js
index ffef1e8954c6d82e9d921eca41c3e95c81766a61..4f9f703716b502f7eee18ff7104153a516ac1260 100644
--- a/src/js/i18n.js
+++ b/src/js/i18n.js
@@ -1799,6 +1799,20 @@ function formatDate(formatter, dateValue) {
                              new GlobalDate(dateMs));
 }
 
+function formatDateToParts(formatter, dateValue) {

[Dan Ehrenberg, 2016/08/29 21:05:06]

Nit: The general V8 convention is to use CamelCase starting with a capital
letter.

+  var dateMs;
+  if (IS_UNDEFINED(dateValue)) {
+    dateMs = %DateCurrentTime();
+  } else {
+    dateMs = TO_NUMBER(dateValue);
+  }
+
+  if (!NUMBER_IS_FINITE(dateMs)) throw %make_range_error(kDateRange);
+
+  return %InternalDateFormatToParts(
+      %GetImplFromInitializedIntlObject(formatter), new GlobalDate(dateMs));
+}
+
 
 /**
  * Returns a Date object representing the result of calling ToString(value)
@@ -2295,6 +2309,7 @@ OverrideFunction(GlobalDate.prototype, 'toLocaleTimeString', function() {
 
 utils.Export(function(to) {
   to.AddBoundMethod = AddBoundMethod;
+  to.formatDateToParts = formatDateToParts;
   to.IntlParseDate = IntlParseDate;
   to.IntlParseNumber = IntlParseNumber;
 });