Add aliases to bot-page and refactor duplicated code

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

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <bot-page-data>
 
@@ skipping 154 matching lines @@
           bot.disks = [];
           for (var i = 0; i < keys.length; i++) {
             bot.disks.push({"id":keys[i], "mb":disks[keys[i]].free_mb});
           }
           // Sort these so the biggest disk comes first.
           bot.disks.sort(function(a, b) {
             return b.mb - a.mb;
           });
         }
 
+        bot.dimensions = bot.dimensions || [];
+        bot.dimensions.forEach(function(dim) {
+          if (swarming.alias.DIMENSIONS_WITH_ALIASES.indexOf(dim.key) !== -1) {
+            dim.value.forEach(function(value, i){
+              dim.value[i] = swarming.alias.apply(value, dim.key);
+            });
+          }
+        });
+
         BOT_TIMES.forEach(function(time) {
           if (bot[time]) {
             bot[time] = new Date(bot[time]);
             bot["human_"+time] = formatDate(bot[time]);
           }
         });
         return bot;
       },
 
       _parseEvents: function(events) {
@@ skipping 55 matching lines @@
           return b.started_ts - a.started_ts;
         });
 
         return tasks;
       }
 
     });
   })();
   </script>
 </dom-module>