swarming: display named caches in task UI

appengine/swarming/ui/res/imp/taskpage/task-page.html

Index: appengine/swarming/ui/res/imp/taskpage/task-page.html
diff --git a/appengine/swarming/ui/res/imp/taskpage/task-page.html b/appengine/swarming/ui/res/imp/taskpage/task-page.html
index 9bf9af3d8cb153588a64db0ac0bcdfa1b87a3ecc..a4ba9dc9826efcb0af63ffb5c9d5825e3916e85e 100644
--- a/appengine/swarming/ui/res/imp/taskpage/task-page.html
+++ b/appengine/swarming/ui/res/imp/taskpage/task-page.html
@@ -332,6 +332,16 @@
                     <td><b>Actual:</b>[[cipd.actual]]</td>
                   </tr>
                 </template>
+
+                <tr hidden$="[[_empty(_request.properties.caches)]]">
+                  <td rowspan$="[[_rowspan(_request.properties.caches)]]">Named caches</td>
+                </tr>
+                <template is="dom-repeat" items="[[_request.properties.caches]]" as="cache">
+                  <tr>
+                    <td><span>[[cache.name]]</span>:<span>[[cache.path]]</span></td>
+                  </tr>
+                </template>
+
               </template>
             </table>
 
@@ -702,6 +712,10 @@
         return dims.length + 1;
       },
 
+      _empty: function(array) {
+        return array.length == 0;
+      },
+
       _supportsMilo: function(request, showRaw) {
         return !showRaw && request && this._tag(request, "allow_milo");
       },