Enable tests related to the extensions web ui that were flaky.

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
diff --git a/chrome/test/data/webui/test_api.js b/chrome/test/data/webui/test_api.js
index be8664310a231be58f9744c91e67ac0f509155e3..f32f5fb5cac4d0ab2ad8fa4dcea7cfa6f409c6eb 100644
--- a/chrome/test/data/webui/test_api.js
+++ b/chrome/test/data/webui/test_api.js
@@ -220,6 +220,23 @@ var testing = {};
     },
 
     /**
+     * Make all transitions and animations take 0ms.
+     * Any animations will still happen and webkit-animation-end should be
+     * listened to.
+     */
+    disableAnimationsAndTransitions: function() {

[Dan Beam, 2015/04/27 18:29:58]

make this static

[hcarmona, 2015/04/29 19:12:32]

Done.

+      var noAnimationStyle = document.createElement('style');
+      noAnimationStyle.textContent =
+        '* {' +
+        '  -webkit-transition-duration: 0ms !important;' +
+        '  -webkit-transition-delay: 0ms !important;' +
+        '  -webkit-animation-duration: 0ms !important;' +
+        '  -webkit-animation-delay: 0ms !important;' +
+        '}';
+      document.querySelector('head').appendChild(noAnimationStyle);
+    },
+
+    /**
      * Create a new class to handle |messageNames|, assign it to
      * |this.mockHandler|, register its messages and return it.
      * @return {Mock} Mock handler class assigned to |this.mockHandler|.