[wasm] support for recompilation if deserialization fails

third_party/WebKit/LayoutTests/http/tests/wasm/resources/load_wasm.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function createWasmModule() {
+    // the file incrementer.wasm is copied from
+    // //v8/test/mjsunit/wasm. This is because currently we cannot
+    // reference files outside the LayoutTests folder. When wasm format
+    // changes require that file to be updated, there is a test on the
+    // v8 side (same folder), ensure-wasm-binaries-up-to-date.js, which
+    // fails and will require incrementer.wasm to be updated on that side.
+    return fetch('incrementer.wasm')
+        .then(response => {
+            if (!response.ok) throw new Error(response.statusText);
+            return response.arrayBuffer();
+        })
+        .then(data => {
+            var mod = new WebAssembly.Module(data);
+            return mod;
+        });
+}