Add LayoutTests for URL list of Response

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

Index: third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/response.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/response.js b/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/response.js
index 66bccf2d4f520d9c57ca4ac6591741deeb8012ed..eae13f905bcdffdc21d25d34351e628dfed7ab24 100644
--- a/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/response.js
+++ b/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/response.js
@@ -25,6 +25,11 @@ test(function() {
                   'Default Response.statusText should be \'OK\'');
     assert_equals(size(response.headers), 0,
                   'Default Response should not have any header.');
+    if (self.internals) {
+      var urlList = self.internals.getInternalResponseURLList(response);
+      assert_equals(size(urlList), 0,

[falken, 2016/12/09 01:54:15]

I think size() is defined in fetch-test-helpers.js and only meant for headers.
Can this just be urlList.length?

[horo, 2016/12/09 05:04:11]

Done.

+                    'The URL list of Default Response should not be empty.');

[falken, 2016/12/09 01:54:15]

The description seems to contradict the assertion.

[horo, 2016/12/09 05:04:11]

Done.

+    }
 
     response.status = 394;
     response.statusText = 'Sesame Street';
@@ -98,6 +103,11 @@ test(function() {
                   'Response.headers should have Content-Type');
     assert_equals(response.headers.get('Content-Type'), 'audio/wav',
                   'Content-Type of Response.headers should be set');
+    if (self.internals) {
+      var urlList = self.internals.getInternalResponseURLList(response);
+      assert_equals(size(urlList), 0,
+                    'The URL list of generated Response should not be empty.');

[falken, 2016/12/09 01:54:15]

ditto with above

[horo, 2016/12/09 05:04:11]

Done.

+    }
 
     response = new Response(new Blob(['dummy'], {type: 'audio/wav'}),
                             {