Import intl test suite from v8-i18n project

test/intl/date-format/resolved-options-is-method.js

Index: test/intl/date-format/resolved-options-is-method.js
diff --git a/src/extensions/i18n/header.js b/test/intl/date-format/resolved-options-is-method.js
similarity index 83%
copy from src/extensions/i18n/header.js
copy to test/intl/date-format/resolved-options-is-method.js
index 1c0a2d8874b5aa982ca2be2fb39f2ead1c4a9622..d7364d4a9eb0508ec9fbaed2d961aa79c7fd0d8a 100644
--- a/src/extensions/i18n/header.js
+++ b/test/intl/date-format/resolved-options-is-method.js
@@ -26,16 +26,16 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // limitations under the License.
 
-// ECMAScript 402 API implementation is broken into separate files for
-// each service. The build system combines them together into one
-// Intl namespace.
+// Test that resolvedOptions is a method, not a property getter and that
+// the result is mutable.
 
-/**
- * Intl object is a single object that has some named properties,
- * all of which are constructors.
- */
-var Intl = (function() {
+var dtf = new Intl.DateTimeFormat();
 
-'use strict';
+var result = dtf.resolvedOptions();
 
-var Intl = {};
+assertTrue(result instanceof Object);
+
+// Result should be mutable.
+result.locale = 'xx';
+
+assertEquals(result.locale, 'xx');