Construct URLSearchParams from sequence initializer.

third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html

Index: third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html
diff --git a/third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html b/third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html
index 16cb9e7dfac5d651d01cf93e808f8b5052d179cd..cd18773659273e00c7e28ad481316bea1d8af202 100644
--- a/third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html
+++ b/third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html
@@ -169,9 +169,16 @@ test(function() {
 }, 'Parse =');
 
 test(function() {
-    var params = new URLSearchParams('foobar=a\nb');
-    assert_equals(params.toString(), 'foobar=a%0Ab');
-}, 'Parse \\n');
+    let params = new URLSearchParams([]);
+    assert_true(params !== null, '1=2&a=b');

[tyoshino (SeeGerritForStatus), 2017/03/01 08:07:26]

can we also compare params.toString() with ""?

the description looks c&p-ed from L176. should be e.g. "Empty sequence".

[sof, 2017/03/01 08:40:59]

oops, guilty :) updated.

+
+    params = new URLSearchParams([[1, 2], ['a', 'b']]);
+    assert_equals(params.toString(), '1=2&a=b');
+
+    assert_type_error(() => { new URLSearchParams([[1, 2, 3]]) },
+      "Sequence elements must be pairs");
+}, 'sequence initializer');
+
 </script>
 </head>
 </html>