[Telemetry] Clean up some page cycler cruft now that idb has moved out.

tools/page_cycler/database/common.js

-// Copyright (c) 2006-2009 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.
-
-/**
- * @fileoverview A collection of common functions used by all database
- * performance tests.
- */
-
-var CANNOT_OPEN_DB = -1;
-var SETUP_FAILED = -2;
-var TEST_FAILED = -3;
-
-var TRANSACTIONS = 1000;  // number of transactions; number of rows in the DB
-var RANDOM_STRING_LENGTH = 20;  // the length of the string on each row
-
-/**
- * Generates a random string of upper-case letters of
- * RANDOM_STRING_LENGTH length.
- */
-function getRandomString() {
-  var s = '';
-  for (var i = 0; i < RANDOM_STRING_LENGTH; i++)
-    s += String.fromCharCode(Math.floor(Math.random() * 26) + 64);
-  return s;
-}
-
-/**
- * Sets up and runs a performance test.
- * @param {!Object} params An object which must have the following fields:
- *   dbName: The database name.
- *   readOnly: If true, transactions will be run using the readTransaction()
- *       method. Otherwise, transaction() will be used.
- *   insertRowsAtSetup: Determines if setting up the database should include
- *       inserting TRANSACTIONS rows in it.
- *   transactionCallback: The transaction callback that should be timed. This
- *       function will be run TRANSACTIONS times and must take a transaction
- *       object as its only parameter.
- *   customRunTransactions: A custom function for running and timing
- *       transactions. If this parameter is not null, runPerformanceTest() will
- *       ignore the txFnct parameter and will call customRunTransactions() as
- *       soon as the setup is complete. In this case, the user is responsible
- *       for running and timing the transactions. If not null, this parameter
- *       must be a function that takes a database object as its only parameter.
- */
-function runPerformanceTest(params) {
-  var db = openTestDatabase(params.dbName);
-  if (!db) {
-    testComplete(CANNOT_OPEN_DB);
-    return;
-  }
-
-  db.transaction(
-      function(tx) {
-        tx.executeSql('CREATE TABLE IF NOT EXISTS Test (ID INT, Foo TEXT)', [],
-                      function(tx, data) {}, function(tx, error) {});
-        tx.executeSql('DELETE FROM Test');
-        if (params.insertRowsAtSetup) {
-          var randomString = getRandomString();
-          for (var i = 0; i < TRANSACTIONS; i++) {
-            tx.executeSql('INSERT INTO Test VALUES (?, ?)',
-                          [i, randomString]);
-          }
-        }
-      }, function(error) {
-        testComplete(SETUP_FAILED);
-      }, function() {
-        if (params.customRunTransactions)
-          params.customRunTransactions(db);
-        else
-          runTransactions(db, params.readOnly, params.transactionCallback);
-      });
-}
-
-/**
- * Opens a database with the given name.
- * @param {string} name The name of the database.
- */
-function openTestDatabase(name) {
-  if (window.openDatabase) {
-    return window.openDatabase(name, '1.0', 'Test database.',
-                               TRANSACTIONS * RANDOM_STRING_LENGTH);
-  }
-
-  return null;
-}
-
-/**
- * Runs the given transaction TRANSACTIONS times.
- * @param {!Object} db The database to run transactions on.
- * @param {boolean} readOnly If true, all transactions will be run using the
- *     db.readTransaction() call. Otherwise, the transactions will be run
- *     using the db.transaction() call.
- * @param {function(!Object)} The transaction callback.
- */
-function runTransactions(db, readOnly, transactionCallback) {
-  var transactionsCompleted = 0;
-  var transactionFunction = readOnly ? db.readTransaction : db.transaction;
-  var startTime = Date.now();
-  for (var i = 0; i < TRANSACTIONS; i++) {
-    transactionFunction.call(db, transactionCallback,
-                             function(error) {
-                               testComplete(TEST_FAILED);
-                             }, function() {
-                               if (++transactionsCompleted == TRANSACTIONS)
-                                 testComplete(Date.now() - startTime);
-                             });
-  }
-}