Add pageable data widget

appengine/swarming/elements/res/imp/botpage/bot-page-demo.html

Index: appengine/swarming/elements/res/imp/botpage/bot-page-demo.html
diff --git a/appengine/swarming/elements/res/imp/botpage/bot-page-demo.html b/appengine/swarming/elements/res/imp/botpage/bot-page-demo.html
index 6e068ec13d1b92e5d0ec5558596a8ba1dd4a84d0..4f71240d862fbc7f03b4373de7ae8bb8014cb883 100644
--- a/appengine/swarming/elements/res/imp/botpage/bot-page-demo.html
+++ b/appengine/swarming/elements/res/imp/botpage/bot-page-demo.html
@@ -45,12 +45,12 @@
         if (idx !=-1) {
           var name = request.url.substring(idx+1, idx+4);
           item = parseInt(name) || 0;
-          name = Math.max(name - 1, 0);
-          name = Math.min(name, arr.length-1);
+          item = Math.max(item - 1, 0);
+          item = Math.min(item, arr.length-1);
         }
 
 
-        request.respond(200, {"Content-Type":"application/json"}, JSON.stringify(arr[name]));
+        request.respond(200, {"Content-Type":"application/json"}, JSON.stringify(arr[item]));
       }
     }