[wasm] support for recompilation if deserialization fails

third_party/WebKit/LayoutTests/http/tests/wasm/wasm_indexeddb_test.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.
+
+var db_name = 'db';
+var obj_store = 'store';
+var module_key = 'my_module';
+
+function createAndSaveToIndexedDB() {
+  return new Promise( (resolve, reject) => {
+    createWasmModule()
+      .then (mod => {
+        var delete_request = indexedDB.deleteDatabase(db_name);
+        delete_request.onsuccess = function() {
+          var open_request = indexedDB.open(db_name);
+          open_request.onupgradeneeded = function() {
+            var db = open_request.result;
+            db.createObjectStore(obj_store);
+          };
+          open_request.onsuccess = function() {
+            var db = open_request.result;
+            var tx = db.transaction(obj_store, 'readwrite');
+            var store = tx.objectStore(obj_store);
+            store.put(mod, module_key);
+            tx.oncomplete = function() {
+              resolve();
+            };
+          };
+        };
+      })
+      .catch(error => reject(error));
+  });
+}
+
+function loadFromIndexedDB(prev) {
+  return new Promise(resolve => {
+    prev.then(() => {
+      var open_request = indexedDB.open(db_name);
+      open_request.onsuccess = function() {
+        var db = open_request.result;
+        var tx = db.transaction(obj_store);
+        var store = tx.objectStore(obj_store);
+        var get_request = store.get(module_key);
+        get_request.onsuccess = function() {
+          var mod = get_request.result;
+          var instance = new WebAssembly.Instance(get_request.result);
+          resolve(instance.exports.increment(1));
+        };
+      };
+    });
+  });
+}
+
+function TestIndexedDBLoadStore() {
+  return loadFromIndexedDB(createAndSaveToIndexedDB())
+    .then((res) => assert_equals(res, 2))
+    .catch(error => assert_unreached(error));
+}