Enable Polymer.Settings.useNativeShadow on the dashboard.

dashboard/dashboard/elements/chart-legend-tooltip-test.html

Index: dashboard/dashboard/elements/chart-legend-tooltip-test.html
diff --git a/dashboard/dashboard/elements/chart-legend-tooltip-test.html b/dashboard/dashboard/elements/chart-legend-tooltip-test.html
index 11060847bf17e236b2f2940f465cca85ffc5dcec..dd9b5648926172df806434498fefee1a1c0f9866 100644
--- a/dashboard/dashboard/elements/chart-legend-tooltip-test.html
+++ b/dashboard/dashboard/elements/chart-legend-tooltip-test.html
@@ -7,6 +7,7 @@ found in the LICENSE file.
 
 <link rel="import" href="/dashboard/elements/chart-legend-tooltip.html">
 <link rel="import" href="/tracing/core/test_utils.html">
+<link rel="import" href="/tracing/ui/base/deep_utils.html">
 
 <script>
 'use strict';
@@ -34,7 +35,7 @@ tr.b.unittest.testSuite(function() {
     Polymer.dom(container).appendChild(legendTooltip);
 
     this.addHTMLOutput(container);
-    document.getElementById('info').click();
+    tr.ui.b.findDeepElementMatching(document.body, '#info').click();
   }, testOptions);
 });
 </script>