Filtering MutationObserver polyfill messages from test_controller logging

pkg/unittest/lib/test_controller.js

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Test controller logic - used by unit test harness to embed tests in
  * conent shell.
  */
 
 // Clear the console before every test run - this is Firebug specific code.
@@ skipping 71 matching lines @@
   }
   // To support in browser launching of tests we post back start and result
   // messages to the window.opener.
   var driver = getDriverWindow();
   if (driver) {
     driver.postMessage(window.document.body.innerHTML, "*");
   }
 }
 
 function processMessage(msg) {
+  if (typeof msg != 'string') return;
   // TODO(ricow): REMOVE, debug info, see issue 13292
   if (!testRunner) {
-    printMessage('processMessage(): ' + msg);
+    // Filter out ShadowDOM polyfill messages which are random floats.
+    if (msg != parseFloat(msg)) {
+      printMessage('processMessage(): ' + msg);
+    }
   }
-  if (typeof msg != 'string') return;
   if (msg == 'unittest-suite-done') {
     notifyDone();
   } else if (msg == 'unittest-suite-wait-for-done') {
     waitForDone = true;
     if (testRunner) {
       testRunner.startedDartTest = true;
     }
   } else if (msg == 'dart-calling-main') {
     if (testRunner) {
       testRunner.startedDartTest = true;
@@ skipping 114 matching lines @@
   try {
     main();
   } catch (e) {
     dartPrint(e);
     if (e.stack) dartPrint(e.stack);
     window.postMessage('unittest-suite-fail', '*');
     return;
   }
   dartPrint('dart-main-done');
 }