Add Physical Web WebUI Default Url Icon

components/physical_web/webui/resources/physical_web.js

Index: components/physical_web/webui/resources/physical_web.js
diff --git a/components/physical_web/webui/resources/physical_web.js b/components/physical_web/webui/resources/physical_web.js
index 70d856fe7db71a2222280e9cda9630a922507d4b..66bc21bd960e1c8677123f7e8565350f11344de4 100644
--- a/components/physical_web/webui/resources/physical_web.js
+++ b/components/physical_web/webui/resources/physical_web.js
@@ -30,6 +30,18 @@ function returnNearbyURLs(nearbyUrlsData) {
     var emptyMessage = $('empty-list-container');
     emptyMessage.hidden = false;
   }
+  assignImageLoadErrorHandlers();
+}
+
+function assignImageLoadErrorHandlers() {
+  var pwIcons = document.querySelectorAll('.physicalWebIcon');
+  pwIcons.forEach(function(e) {
+    let img = e.getElementsByTagName('img')[0];

[mmocny, 2017/03/23 20:58:39]

Could we just change the querySelectorAll to do this for us?  You can use nested
selectors, try this:

'.physicalWebIcon > img'

[Ran, 2017/03/24 17:48:29]

Done.

+    img.addEventListener('error', function() {
+      img.src =
+          'chrome://physical-web/ic_link_grey600_36dp.png';
+    });
+  });
 }
 
 document.addEventListener('DOMContentLoaded', requestNearbyURLs);