Check and canonicalize CSS selectors before registering PageStateMatchers.

chrome/renderer/resources/extensions/test_custom_bindings.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.
 
 // test_custom_bindings.js
 // mini-framework for ExtensionApiTest browser tests
 
 var binding = require('binding').Binding.create('test');
 
 var chrome = requireNative('chrome').GetChrome();
@@ skipping 217 matching lines @@
     chromeTest.assertEq(expectedError, chrome.runtime.lastError.message);
   });
 
   apiFunctions.setHandleRequest('assertThrows',
                                 function(fn, self, args, message) {
     chromeTest.assertTrue(typeof fn == 'function');
     try {
       fn.apply(self, args);
       chromeTest.fail('Did not throw error: ' + fn);
     } catch (e) {
-      if (message !== undefined)
-        chromeTest.assertEq(message, e.message);
+      if (e != failureException && message !== undefined) {
+        if (message instanceof RegExp) {
+          chromeTest.assertTrue(message.test(e.message),
+                                e.message + ' should match ' + message)
+        } else {
+          chromeTest.assertEq(message, e.message);
+        }
+      }
     }
   });
 
   function safeFunctionApply(func, args) {
     try {
       if (func)
         $Function.apply(func, null, args);
     } catch (e) {
       var msg = "uncaught exception " + e;
       chromeTest.fail(msg);
@@ skipping 66 matching lines @@
   apiFunctions.setHandleRequest('getApiDefinitions', function() {
     return GetExtensionAPIDefinitionsForTest();
   });
 
   apiFunctions.setHandleRequest('getApiFeatures', function() {
     return GetAPIFeatures();
   });
 });
 
 exports.binding = binding.generate();