[Fetch] Accept URLSearchParams in Response constructor

third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/response-content.js

 if (self.importScripts) {
   importScripts('../resources/fetch-test-helpers.js');
 }
 
 promise_test(function() {
     var response = new Response;
     return response.text()
       .then(function(text) {
           assert_equals(text, '',
                         'response.text() must return an empty string' +
@@ skipping 97 matching lines @@
             '\r\n' +
             'file content\r\n' +
             '--' + boundary + '--\r\n';
           assert_equals(
             result, expected_body,
             'Creating a Response with FormData body must succeed.');
         });
   }, 'Behavior of Response with FormData content');
 
 promise_test(function() {
+    var urlSearchParams = new URLSearchParams();

[yhirano, 2016/07/21 09:00:27]

I prefer const / let for new code whenever possible.

[e_hakkinen, 2016/07/21 12:02:25]

Done.

+    urlSearchParams.append('sample string', '1234567890');
+    urlSearchParams.append('sample string 2', '1234567890 & 2');
+    var response = new Response(urlSearchParams);
+    assert_equals(
+      response.headers.get('Content-Type'),
+      'application/x-www-form-urlencoded;charset=UTF-8',
+      'A Response constructed with an URLSearchParams should have a Content-Type.');

[tyoshino (SeeGerritForStatus), 2016/07/21 07:30:28]

an URLSearchParams -> a URLSearchParams as it's pronunciation starts with /ju:/

[e_hakkinen, 2016/07/21 12:02:25]

Done.

+    return response.text()
+      .then(function(result) {
+          assert_equals(
+            result, 'sample+string=1234567890&sample+string+2=1234567890+%26+2',
+            'Creating a Response with URLSearchParams body must succeed.');
+        });
+  }, 'Behavior of Response with URLSearchParams content');
+
+promise_test(function() {
     var headers = new Headers;
     headers.set('Content-Language', 'ja');
     var response = new Response(
       'test string', {method: 'GET', headers: headers});
     assert_false(response.bodyUsed);
     var response2 = response.clone();
     assert_false(response.bodyUsed, 'bodyUsed is not set by clone().');
     assert_false(response2.bodyUsed, 'bodyUsed is not set by clone().');
     response.headers.set('Content-Language', 'en');
     assert_equals(
@@ skipping 40 matching lines @@
       'A Response constructed with no body should have no Content-Type.');
     return response.text()
       .then(function(text) {
           assert_equals(text, '',
                         'Response with no body accessed as text should ' +
                         'resolve to the empty string.');
         });
   }, 'Behavior of Response with no body.');
 
 done();