Make silent task retries more obvious

appengine/swarming/ui/res/imp/common/task-behavior.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.
 
   It contains the definition of the following Behaviors:
 
     SwarmingBehaviors.TaskBehavior
 
   This behavior contains many constants and some functions that are useful
@@ skipping 57 matching lines @@
         if (state === this.BOT_DIED) {
           return "bot_died";
         }
         if (state === this.COMPLETED_FAILURE) {
           return "failed_task";
         }
         if (state === this.RUNNING || state === this.PENDING) {
           return "pending_task";
         }
         return "";
-      }
+      },
+
+      state: function(result) {
+        if (!result) {
+          return "";
+        }
+        if (result.state === this.COMPLETED) {
+          if (result.failure) {
+            return this.COMPLETED_FAILURE;
+          }
+          if (result.try_number === "0") {
+            return this.COMPLETED_DEDUPED;
+          }
+          return this.COMPLETED_SUCCESS;
+        }
+        return result.state;
+      },
+
+      _stateClass: function(result) {
+        return this.stateClass(this.state(result));
+      },
     };
   })();
 </script>
 
 <dom-module id="task-style">
   <template>
     <style>
       /* These colors are from buildbot */
       .failed_task {
         background-color: #ffdddd;
       }
       .bot_died {
         background-color: #cccccc;
       }
       .exception {
         background-color: #edd2ff;
       }
       .pending_task {
         background-color: #fffc6c;
       }
     </style>
   </template>
 </dom-module>