Adds a snooze button to the sheriff-o-matic ui

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._computeProperties = function() {
+  this.isSnoozed = Date.now() < this.annotation.snoozeTime;
+};
+
+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).forEach(function(key) {

[ojan, 2014/08/07 00:09:57]

Nit: The sugarjs Object.keys takes a callback function, so you can do:
Object.keys(newAnnotation, function(key, value) { ... });

[dstockwell, 2014/08/11 01:20:42]

Done.

+      var value = newAnnotation[key];
+      if (typeof value == 'undefined') {

[ojan, 2014/08/07 00:09:58]

Nit: I'd just do:
if (value === undefined)
  ...
else
  ...

Or, even just
if (value)
  annotation[key] = value;
else
  delete annotation[key];

All nits though.

[dstockwell, 2014/08/11 01:20:42]

Done.

+        delete annotation[key];
+      } else {
+        annotation[key] = value;
+      }
+    });
+
+    if (Object.keys(annotation).length == 0) {

[ojan, 2014/08/07 00:09:57]

sugarjs has Object.size. So this can just be
if (Object.size(annotation))
  annotations[this.key] = annotation;
else
  delete annotations[this.key];

[dstockwell, 2014/08/11 01:20:42]

Done.

+      delete annotations[this.key];
+    } else {
+      annotations[this.key] = annotation;
+    }
+
+    localStorage.CTFailureGroupAnnotations = JSON.stringify(annotations);
+
+    this.annotation = annotation;
+    this._computeProperties();
+  }.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>