Add a "Link Bug" button to associate a bug with a failure

Tools/GardeningServer/model/ct-failure-group.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <script>
 function CTFailureGroup(key, failures, annotation) {
   this.key = key;
   this.failures = failures;
   this.annotation = annotation || {};
   this._computeProperties();
 }
 
 CTFailureGroup.prototype.snoozeUntil = function(time) {
   return this._annotate({
     snoozeTime: time,
   });
 };
 
 CTFailureGroup.prototype.unsnooze = function() {
   return this._annotate({
     snoozeTime: undefined,
   });
 };
 
+CTFailureGroup.prototype.setBug = function(bug) {
+  return this._annotate({
+    bugNumber: bug,

[ojan, 2014/08/15 04:53:39]

Can we s/bugNumber/bug and have the value actually be a URL? That way we can
link to v8/skia/etc bugs as well. We still allow you to just input a number and
we prepend the crbug.com for you before we store the value.

[cbiesinger, 2014/08/16 00:46:15]

Done.

+  });
+};
+
 CTFailureGroup.prototype._computeProperties = function() {
   this.isSnoozed = Date.now() < this.annotation.snoozeTime;
+  this.hasBug = this.annotation.bugNumber !== undefined;

[ojan, 2014/08/15 04:53:39]

Lets just set this.bug. 

Also, we should make annotation private (i.e., this._annotation).

[cbiesinger, 2014/08/16 00:46:15]

Done.

 };
 
 CTFailureGroup.prototype._annotate = function(newAnnotation) {
   // FIXME: Post the new annotation to frontend rather than storing locally.
   return CTFailureGroup.fetchAnnotations().then(function(annotations) {
     var annotation = annotations[this.key] || {};
 
     Object.keys(newAnnotation, function(key, value) {
       if (value === 'undefined') {
         delete annotation[key];
@@ skipping 15 matching lines @@
   }.bind(this));
 };
 
 CTFailureGroup.fetchAnnotations = function() {
   // FIXME: Fetch annotations from frontend.
   var stored = localStorage.CTFailureGroupAnnotations;
   var annotations = stored ? JSON.parse(stored) : {};
   return Promise.resolve(annotations);
 };
 </script>