Turn on Polymer TodoMVC tests on Dart buildbots

pkg/unittest/lib/test_controller.js

Index: pkg/unittest/lib/test_controller.js
diff --git a/pkg/unittest/lib/test_controller.js b/pkg/unittest/lib/test_controller.js
index 439b7033aea8b4d4a097ec61f907ad8848ba0cc4..fc8db1611a5ae5b792cff8cfba3b2e6357dd3ede 100644
--- a/pkg/unittest/lib/test_controller.js
+++ b/pkg/unittest/lib/test_controller.js
@@ -23,7 +23,8 @@ window.onerror = function (message, url, lineNumber) {
   window.postMessage('unittest-suite-external-error', '*');
 };
 
-if (navigator.webkitStartDart) {
+// Start Dartium/content_shell, unless we are waiting for HTML Imports to load.
+if (navigator.webkitStartDart && !window.HTMLImports) {

[Siggi Cherem (dart-lang), 2013/08/28 19:46:51]

mmm. I worry there might be cases where people use htmlimports without boot.js
and this script would not behave as expected. I wonder if we should just use a
generic flag and configure it from boot.js or the html test page. For example,
"window.__testControllerDontStartDart"?

[Jennifer Messerly, 2013/08/28 19:56:04]

Chatted in person ... we should really move some of that the logic from
Polymer's boot.js to HTML Imports polyfill, so HTML Imports is the right thing
to check.

   navigator.webkitStartDart();
 }