Implement URLSearchParams.

LayoutTests/fast/domurl/url-search.html

Index: LayoutTests/fast/domurl/url-search.html
diff --git a/LayoutTests/fast/domurl/url-search.html b/LayoutTests/fast/domurl/url-search.html
index 9aeb0c580c81e89ceada1249ed885c33ebc43096..b38964e589e7145f881ccb70f2d119384b81533a 100644
--- a/LayoutTests/fast/domurl/url-search.html
+++ b/LayoutTests/fast/domurl/url-search.html
@@ -3,7 +3,6 @@
 <script src="../../resources/testharness.js"></script>
 <script src="../../resources/testharnessreport.js"></script>
 <script>
-
 test(function() {
     var url = new URL('http://www.domain.com/');
     assert_equals(url.search, '');
@@ -51,4 +50,22 @@ test(function() {
     assert_equals(url.href, 'invalid');
 }, 'search property invalid URL');
 
+test(function() {
+    var url = new URL('http://example.org/file?a=b&c=d');
+    var searchParams = url.searchParams;
+    assert_true(searchParams != null);
+    assert_equals(searchParams.toString(), "a=b&c=d");
+
+    url.search = 'e=f&g=h';
+    assert_equals(searchParams.toString(), "e=f&g=h");
+
+    searchParams.append('i', ' j ');
+    assert_equals(url.search, "?e=f&g=h&i=+j+");
+
+    searchParams.set('e', 'updated');
+    assert_equals(url.search, "?e=updated&g=h&i=+j+");
+
+    assert_throws({name: "TypeError"}, function() { url.searchParams = {}; });
+
+}, 'search and searchParams');
 </script>