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 b050945951938506355bfc04751d0abe32defa84..86002dd5027c47f343ec945f5c6dc06e7bb474c9 100644
--- a/components/physical_web/webui/resources/physical_web.js
+++ b/components/physical_web/webui/resources/physical_web.js
@@ -25,6 +25,8 @@ function renderTemplate(nearbyUrlsData) {
   // This is the javascript code that processes the template:
   jstProcess(new JsEvalContext(nearbyUrlsData), templateDiv);
 
+  assignImageLoadErrorHandlers();
+
   let bodyContainer = $('body-container');
   bodyContainer.hidden = false;
 }
@@ -41,4 +43,15 @@ function pushNearbyURLs(nearbyUrlsData) {
   renderTemplate(nearbyUrlsData);
 }
 
+function assignImageLoadErrorHandlers() {
+  var pwIcons = document.querySelectorAll('.physicalWebIcon');
+  pwIcons.forEach(function(e) {
+    let img = e.getElementsByTagName('img')[0];
+    img.addEventListener('error', function() {
+      img.src =
+          'chrome://physical-web/ic_link_grey600_36dp.png';
+    });
+  });
+}
+
 document.addEventListener('DOMContentLoaded', physicalWebPageLoaded);