Initial checkin of a perf test suite for Indexed Database. This just has a

chrome/test/data/indexeddb/perf_shared.js

Index: chrome/test/data/indexeddb/perf_shared.js
diff --git a/chrome/test/data/indexeddb/perf_shared.js b/chrome/test/data/indexeddb/perf_shared.js
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+// Copyright (c) 2012 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.
+
+window.indexedDB = window.indexedDB || window.webkitIndexedDB ||
+    window.mozIndexedDB || window.msIndexedDB;
+
+var automation = {
+  results: {}
+};
+
+automation.setDone = function() {
+  this.setStatus("Test complete.");
+  document.cookie = '__done=1; path=/';
+};
+
+automation.addResult = function(name, result) {
+  result = "" + result;
+  this.results[name] = result;
+  var elt = document.getElementById('results');
+  var div = document.createElement('div');
+  div.innerText = name + ": " + result;
+  elt.appendChild(div);
+};
+
+automation.getResults = function() {
+  return this.results;
+};
+
+automation.setStatus = function(s) {
+  document.getElementById('status').innerText = s;
+};
+
+function assert(t) {
+  if (!t) {
+    var e = new Error("Assertion failed!");
+    console.log(e.stack);
+    throw e;
+  }
+}
+
+function onError(e) {
+  console.log(e);
+  e.stopPropagation();
+  throw new Error(e);
+}
+
+var version = 2;  // The version with our object stores.
+var db;
+
+function createDatabase(name, objectStores, handler, errorHandler) {
+  var openRequest = indexedDB.open(name, version);
+  openRequest.onblocked = errorHandler;
+  function createObjectStores(db) {
+    for (var store in objectStores) {
+      var name = objectStores[store];
+      assert(!db.objectStoreNames.contains(name));
+      db.createObjectStore(name);
+    }
+  }
+  openRequest.onupgradeneeded = function(ev) {
+    // TODO: This is the spec-compliant path, which doesn't yet work in Chrome,
+    // and isn't yet tested, as this function won't currently be called.
+    assert(openRequest == ev.target);
+    db = openRequest.result;
+    createObjectStores(db);
+    // onsuccess will get called after this exits.
+  };
+  openRequest.onsuccess = function(ev) {
+    assert(openRequest == ev.target);
+    db = openRequest.result;
+    db.onerror = function(ev) {
+      console.log("db error", arguments, openRequest.webkitErrorMessage);
+      errorHandler();
+    }
+    if (db.version != version) {
+      // This is the current Chrome path.
+      var setVersionRequest = db.setVersion(version);
+      setVersionRequest.onfailure = errorHandler;
+      setVersionRequest.onsuccess =
+          function(e) {
+            assert(setVersionRequest == e.target);
+            createObjectStores(db);
+            var versionTransaction = setVersionRequest.result;
+            versionTransaction.oncomplete = function() {handler(db); };
+            versionTransaction.onerror = onError;
+          }
+    } else {
+      handler(db);
+    }
+  }
+}
+
+function getTransaction(db, objectStoreNames, mode, opt_handler) {
+  var transaction = db.transaction(objectStoreNames, mode);
+  transaction.onerror = onError;
+  transaction.onabort = onError;
+  if (opt_handler) {
+    transaction.oncomplete = opt_handler;
+  }
+  return transaction;
+}
+
+function deleteDatabase(name, opt_handler) {
+  var deleteRequest = indexedDB.deleteDatabase(name);
+  deleteRequest.onerror = onError;
+  if (opt_handler) {
+    deleteRequest.onsuccess = opt_handler;
+  }
+}
+
+function cleanUp(opt_handler) {
+  if (db) {
+    deleteDatabase(db, opt_handler);
+    db = null;
+  }
+}
+
+function stringOfLength(n) {
+  assert(n > 0);
+  assert(n == Math.floor(n));
+  return new Array(n + 1).join('0');
+}