Add support for setting sheriff-specific bug labels.

dashboard/dashboard/templates/edit_sheriffs.html

Index: dashboard/dashboard/templates/edit_sheriffs.html
diff --git a/dashboard/dashboard/templates/edit_sheriffs.html b/dashboard/dashboard/templates/edit_sheriffs.html
index ba9d933176390eea58e580df2ce22cfe0ab239b4..f7a7329827ea118ed17820a5d18460260e4659d4 100644
--- a/dashboard/dashboard/templates/edit_sheriffs.html
+++ b/dashboard/dashboard/templates/edit_sheriffs.html
@@ -55,6 +55,7 @@ found in the LICENSE file.
     document.getElementById('summarize-' + summarize).checked = true;
 
     document.getElementById('patterns-textarea').value = sheriff['patterns'];
+    document.getElementById('labels').value = sheriff['labels'];
     document.getElementById('list-tests-button').hidden = false;
   }
 
@@ -69,6 +70,7 @@ found in the LICENSE file.
     document.getElementById('internal-only-yes').checked = true;
     document.getElementById('summarize-no').checked = true;
     document.getElementById('patterns-textarea').textContent = '';
+    document.getElementById('labels').value = '';
     document.getElementById('list-tests-button').hidden = true;
   }
 
@@ -132,6 +134,10 @@ found in the LICENSE file.
         <td><label for="email">Notification Email:</label></td>
         <td><input type="email" name="email" id="email" size=75></td>
       </tr>
+      <tr>
+        <td><label for="labels">Bug labels to add (comma-separated):</label></td>
+        <td><input type="text" name="labels" id="labels" size=75></td>
+      </tr>
       </tr>
         <td><label for="email">Days before alerting on missing data
         (-1 for no alerts):</label></td>