Reorder declaration vs. usage, build padToWidth on top of stringOfLength.

chrome/test/data/indexeddb/perf_shared.js

 // 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;
 window.IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange;
 
 var automation = {
   results: {}
@@ skipping 175 matching lines @@
   // TODO(ericu): Make test errors delete the database automatically.
   return getDisplayName.caller.name + "_" +
       Array.prototype.slice.call(args, 0, args.length - 1).join("_");
 }
 
 // Pad a string [or object convertible to a string] to a fixed width; use this
 // to have numeric strings sort properly.
 function padToWidth(s, width) {
   s = String(s);
   assert(s.length <= width);
-  while (s.length < width) {
-    s = "0" + s;
+  if (s.length < width) {
+    s = stringOfLength(width - s.length, '0') + s;
   }
   return s;
 }
 
+function stringOfLength(n, c) {
+  if (c == null)
+    c = 'X';
+  assert(n > 0);
+  assert(n == Math.floor(n));
+  return new Array(n + 1).join(c);
+}
+
 function getSimpleKey(i) {
   return "key " + padToWidth(i, 10);
 }
 
 function getSimpleValue(i) {
   return "value " + padToWidth(i, 10);
 }
 
 function getForwardIndexKey(i) {
   return i;
@@ skipping 115 matching lines @@
       if (oos) // Put in random order for maximum difficulty.
         oos.put(cursor.value, Math.random());
       values.push({key: cursor.key, value: cursor.value});
       cursor.continue();
     } else {
       assert(!numReadsLeft);
     }
   }
   request.onerror = onError;
 }
-
-
-function stringOfLength(n) {
-  assert(n > 0);
-  assert(n == Math.floor(n));
-  return new Array(n + 1).join('0');
-}