Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/cors/cors-origin.js

+if (this.document === undefined) {
+  importScripts("/common/utils.js");
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+  importScripts("/common/get-host-info.sub.js")
+}
+
+/* If origin is undefined, it is set to fetched url's origin*/
+function corsOrigin(desc, baseURL, method, origin, shouldPass) {
+  if (!origin)
+    origin = baseURL;
+
+  var uuid_token = token();
+  var urlParameters = "?token=" + uuid_token + "&max_age=0&origin=" + encodeURIComponent(origin) + "&allow_methods=" + method;
+  var url = baseURL + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+  var requestInit = {"mode": "cors", "method": method};
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      if (shouldPass) {
+        return fetch(url + urlParameters, requestInit).then(function(resp) {
+          assert_equals(resp.status, 200, "Response's status is 200");
+        });
+      } else {
+        return promise_rejects(test, new TypeError(), fetch(url + urlParameters, requestInit));
+      }
+    });
+  }, desc);
+
+}
+
+var host_info = get_host_info();
+
+/* Actual origin */
+var origin = host_info.HTTP_ORIGIN;
+
+corsOrigin("Cross domain different subdomain [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "GET", origin, true);
+corsOrigin("Cross domain different subdomain [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "GET", undefined, false);
+corsOrigin("Same domain different port [origin OK]", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT, "GET", origin, true);
+corsOrigin("Same domain different port [origin KO]", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT, "GET", undefined, false);
+corsOrigin("Cross domain different port [origin OK]", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, "GET", origin, true);
+corsOrigin("Cross domain different port [origin KO]", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, "GET", undefined, false);
+corsOrigin("Cross domain different protocol [origin OK]", host_info.HTTPS_REMOTE_ORIGIN, "GET", origin, true);
+corsOrigin("Cross domain different protocol [origin KO]", host_info.HTTPS_REMOTE_ORIGIN, "GET", undefined, false);
+corsOrigin("Same domain different protocol different port [origin OK]", host_info.HTTPS_ORIGIN, "GET", origin, true);
+corsOrigin("Same domain different protocol different port [origin KO]", host_info.HTTPS_ORIGIN, "GET", undefined, false);
+corsOrigin("Cross domain [POST] [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "POST", origin, true);
+corsOrigin("Cross domain [POST] [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "POST", undefined, false);
+corsOrigin("Cross domain [HEAD] [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "HEAD", origin, true);
+corsOrigin("Cross domain [HEAD] [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "HEAD", undefined, false);
+corsOrigin("CORS preflight [PUT] [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "PUT", origin, true);
+corsOrigin("CORS preflight [PUT] [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "PUT", undefined, false);
+corsOrigin("Allowed origin: \"\" [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "GET", "" , false);
+
+done();