Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/basic/scheme-blob.js

+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+}
+
+function checkFetchResponse(url, data, mime, size, desc) {
+  promise_test(function(test) {
+    size = size.toString();
+    return fetch(url).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type, "basic", "response type is basic");
+      assert_equals(resp.headers.get("Content-Type"), mime, "Content-Type is " + resp.headers.get("Content-Type"));
+      assert_equals(resp.headers.get("Content-Length"), size, "Content-Length is " + resp.headers.get("Content-Length"));
+      return resp.text();
+    }).then(function(bodyAsText) {
+      assert_equals(bodyAsText, data, "Response's body is " + data);
+    });
+  }, desc);
+}
+
+var blob = new Blob(["Blob's data"], { "type" : "text/plain" });
+checkFetchResponse(URL.createObjectURL(blob), "Blob's data", "text/plain",  blob.size,
+                  "Fetching [GET] URL.createObjectURL(blob) is OK");
+
+function checkKoUrl(url, method, desc) {
+  promise_test(function(test) {
+    var promise = fetch(url, {"method": method});
+    return promise_rejects(test, new TypeError(), promise);
+  }, desc);
+}
+
+var blob2 = new Blob(["Blob's data"], { "type" : "text/plain" });
+checkKoUrl("blob:http://{{domains[www]}}:{{ports[http][0]}}/", "GET",
+          "Fetching [GET] blob:http://{{domains[www]}}:{{ports[http][0]}}/ is KO");
+
+var invalidRequestMethods = [
+  "POST",
+  "OPTIONS",
+  "HEAD",
+  "PUT",
+  "DELETE",
+  "INVALID",
+];
+invalidRequestMethods.forEach(function(method) {
+  checkKoUrl(URL.createObjectURL(blob2), method, "Fetching [" + method + "] URL.createObjectURL(blob) is KO");
+});
+
+done();