Handles default revision ranges.

dashboard/dashboard/elements/speed-releasing-table.html

Index: dashboard/dashboard/elements/speed-releasing-table.html
diff --git a/dashboard/dashboard/elements/speed-releasing-table.html b/dashboard/dashboard/elements/speed-releasing-table.html
index 9f15451ece497bd57dc8173a0e002c1ecbe188ee..d28902974c11ce95ffdf9b8822de525cdaf9de68 100644
--- a/dashboard/dashboard/elements/speed-releasing-table.html
+++ b/dashboard/dashboard/elements/speed-releasing-table.html
@@ -60,12 +60,15 @@ found in the LICENSE file.
             <table id="speed-releasing">
               <thead>
                <tr>
-                  <th colspan="2"></th>
-                  <template is="dom-repeat" items="{{tableConfig.revisions}}" 
+                  <th colspan="2" rowspan="1"></th>
+                  <template is="dom-repeat" 
+                            items="{{tableConfig.displayRevisions}}" 
                             as="rev">
-                    <th>Version: {{rev}}</th>
+                    <th colspan="1">
+                      {{getCurrOrRef(index)}} Version: {{rev}}
+                    </th>
                   </template>
-                  <th colspan="4">Change</th>
+                  <th colspan="2">Change</th>
                 </tr>
               </thead>
               <template is="dom-repeat" items="{{tableConfig.tests}}" 
@@ -124,6 +127,10 @@ found in the LICENSE file.
         },
       },
 
+      getCurrOrRef: function(index) {
+        return index ? 'Reference' : 'Current';
+      },
+
       /**
        * Gets the specified value given a rev, bot, test.
        */
@@ -215,6 +222,7 @@ found in the LICENSE file.
             this.tableConfig.revisions = response['revisions'];
             this.tableConfig.units = response['units'];
             this.tableConfig.categories = response['categories'];
+            this.tableConfig.displayRevisions = response['display_revisions'];
             this.loading = false;
           }.bind(this),
           function(msg) {