Expose Fetch API related classes to Window and WorkerGlobalScope.

LayoutTests/http/tests/fetch/resources/request.js

Index: LayoutTests/http/tests/fetch/resources/request.js
diff --git a/LayoutTests/http/tests/fetch/resources/request.js b/LayoutTests/http/tests/fetch/resources/request.js
new file mode 100644
index 0000000000000000000000000000000000000000..1fbf5da2089be725706b5f345582233cc4cb92e7
--- /dev/null
+++ b/LayoutTests/http/tests/fetch/resources/request.js
@@ -0,0 +1,25 @@
+var global = this;
+if (global.importScripts) {
+    // Worker case
+    importScripts('/resources/testharness.js');
+}
+
+test(function(test) {
+    var request = new Request('');
+    assert_equals(request.constructor, Request);
+}, 'Create request');
+
+test(function(test) {
+    var response = new Response;
+    assert_equals(response.constructor, Response);
+}, 'Create response');
+
+test(function(test) {
+    var headers = new Headers;
+    assert_equals(headers.constructor, Headers);
+}, 'Create headers');
+
+if (global.importScripts) {
+    // Worker case
+    done();
+}