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

All changes in perf_test.js are reorders--no actual code change.

BUG=137764
TEST=self

Review URL: https://chromiumcodereview.appspot.com/10828119

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149477 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/data/indexeddb/perf_shared.js

@@ -193,12 +193,20 @@ function getDisplayName(args) {
 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);
 }
@@ -334,10 +342,3 @@ function getValuesFromCursor(
   }
   request.onerror = onError;
 }
-
-
-function stringOfLength(n) {
-  assert(n > 0);
-  assert(n == Math.floor(n));
-  return new Array(n + 1).join('0');
-}