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

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

Index: Tools/GardeningServer/model/ct-failure-group.html
diff --git a/Tools/GardeningServer/model/ct-failure-group.html b/Tools/GardeningServer/model/ct-failure-group.html
index 84d01dc9177f9b3b34157482aece5da39e030ff7..6ad9487f2fe1cc5029106efa853ad063e290c5f5 100644
--- a/Tools/GardeningServer/model/ct-failure-group.html
+++ b/Tools/GardeningServer/model/ct-failure-group.html
@@ -24,8 +24,15 @@ CTFailureGroup.prototype.unsnooze = function() {
   });
 };
 
+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) {