Initial Fetch integration for Subresource Integrity

LayoutTests/http/tests/fetch/script-tests/request.js

 if (self.importScripts) {
   importScripts('../resources/fetch-test-helpers.js');
 }
 
 var URL = 'https://www.example.com/test.html';
 
 test(function() {
     var headers = new Headers;
     headers.set('User-Agent', 'Mozilla/5.0');
     headers.set('Accept', 'text/html');
@@ skipping 231 matching lines @@
             }
             request2 = new Request(request1, init2);
             assert_equals(request2.redirect,
                           redirect2 ? redirect2 : request1.redirect,
                           'Request.redirect should be overridden');
           });
       });
   }, 'Request redirect test');
 
 test(function() {
+    var request1 = {};
+    var request2 = {};
+    var init = {};
+    request1 = new Request(URL, init);
+    assert_equals(request1.integrity, '',
+                  'Request.integrity should be empty on init');
+    init['integrity'] = 'sha256-deadbeef';
+    request1 = new Request(URL, init);
+    assert_equals(request1.integrity, 'sha256-deadbeef',
+                  'Request.integrity match the integrity of init');
+    request2 = new Request(request1);
+    assert_equals(request2.integrity, 'sha256-deadbeef',
+                  'Request.integrity should match');
+    init['mode'] = 'no-cors';
+    assert_throws(
+        {name: 'TypeError'},
+        function() {
+            var request = new Request(URL, init);
+        },
+        'new Request with a non-empty integrity and mode of \'no-cors\' should throw');
+}, 'Request integrity test');
+
+test(function() {
     ['same-origin', 'cors', 'no-cors'].forEach(function(mode) {
         FORBIDDEN_METHODS.forEach(function(method) {
             assert_throws(
               {name: 'TypeError'},
               function() {
                 var request = new Request(URL, {mode: mode, method: method});
               },
               'new Request with a forbidden method (' + method + ') should ' +
               'throw');
           });
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 // Tests for requests context.
 test(function() {
     var request = new Request('http://localhost/', {method: 'POST', body: ''});
     assert_equals(request.context, '',
                   'Request.context should be empty string ' +
                   'for synthetic Request object');
   }, 'RequestContext of a synthetic Request object');
 
 done();