Made Print Preview tests autogenerated from print_preview.js.

chrome/browser/ui/webui/javascript2webui.js

 // Copyright (c) 2011 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.
 if (arguments.length < 3) {
   print('usage: ' +
         arguments[0] + ' path-to-testfile.js testfile.js [output.cc]');
   quit();
 }
 var js_file = arguments[1];
 var js_file_base = arguments[2];
 var outputfile = arguments[3];
 var prevfuncs = {};
 for (var func in this) {
   if (this[func] instanceof Function)
     prevfuncs[func] = func;
 }
 var js = load(js_file);
 if (!('test_fixture' in this)) {
   print(js_file + ' did not define test_fixture.');
   quit(-1);
 }
+if (!('test_add_library' in this)) {
+  this['test_add_library'] = true;
+}
 print('// GENERATED FILE');
 print('// ' + arguments.join(' '));
 print('// PLEASE DO NOT HAND EDIT!');
 print();
 for (var func in this) {
   if (!prevfuncs[func] && this[func] instanceof Function) {
     print('IN_PROC_BROWSER_TEST_F(' + test_fixture + ', ' + func + ') {');
-    print('  AddLibrary(FilePath(FILE_PATH_LITERAL("' + js_file_base + '")));');
+    if (test_add_library)
+      print('  AddLibrary(FilePath(FILE_PATH_LITERAL("' + js_file_base +
+            '")));');
     print('  ASSERT_TRUE(RunJavascriptTest("' + func + '"));');
     print('}');
     print();
   }
 }