Telemetry: make media perf tests log errors rather than timing out

tools/telemetry/telemetry/page/actions/loop.js

Index: tools/telemetry/telemetry/page/actions/loop.js
diff --git a/tools/telemetry/telemetry/page/actions/loop.js b/tools/telemetry/telemetry/page/actions/loop.js
index 00ab8d73ec66983d9eb296ed4c430f810f18097b..f8627843e68602fbe6b70c45c7a088b670800a7a 100644
--- a/tools/telemetry/telemetry/page/actions/loop.js
+++ b/tools/telemetry/telemetry/page/actions/loop.js
@@ -20,6 +20,7 @@
   }
 
   function loopHTML5Element(element, loopCount) {
+    window.__registerHTML5ErrorEvents(element);
     element['loop_completed'] = false;
     var currentLoop = 0;
     var onLoop = function(e) {
@@ -35,11 +36,6 @@
       }
     };
 
-    function onError(e) {
-      throw new Error('Error playing media :' + e.type);
-    }
-    element.addEventListener('error', onError);
-    element.addEventListener('abort', onError);
     element.addEventListener('seeked', onLoop);
     element.loop = true;