Make generic-set-span support URLs.

tracing/tracing/value/ui/generic_set_span.html

Index: tracing/tracing/value/ui/generic_set_span.html
diff --git a/tracing/tracing/value/ui/generic_set_span.html b/tracing/tracing/value/ui/generic_set_span.html
index 8e0353df53f417cba9a985a20651c66b56db55aa..5a92b8ebcc5684a35957af08f8b4514e7a0ca947 100644
--- a/tracing/tracing/value/ui/generic_set_span.html
+++ b/tracing/tracing/value/ui/generic_set_span.html
@@ -5,13 +5,29 @@ Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
+<link rel="import" href="/tracing/base/utils.html">
 <link rel="import" href="/tracing/ui/analysis/generic_object_view.html">
 <link rel="import" href="/tracing/value/ui/diagnostic_span_behavior.html">
 
 <dom-module id="tr-v-ui-generic-set-span">
   <template>
+    <style>
+      a {
+        display: block;
+      }
+    </style>
+
     <tr-ui-a-generic-object-view id="generic"></tr-ui-a-generic-object-view>
-    <template is="dom-repeat" items="{{strings_}}">[[item]]<br></template>
+
+    <template is="dom-repeat" items="{{strings_}}">
+      <template is="dom-if" if="[[isUrl_(item)]]">
+        <a href="[[item]]">[[item]]</a>
+      </template>
+
+      <template is="dom-if" if="[[!isUrl_(item)]]">
+        <div>[[item]]</div>
+      </template>
+    </template>
   </template>
 </dom-module>
 
@@ -28,6 +44,10 @@ tr.exportTo('tr.v.ui', function() {
       },
     },
 
+    isUrl_(s) {
+      return tr.b.isUrl(s);
+    },
+
     updateContents_() {
       if (this.diagnostic === undefined) {
         this.$.generic.object = undefined;