Update the Website Settings page when the power consumption is updated.

components/power/origin_power_map.cc

 // 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.
 
 #include "components/power/origin_power_map.h"
 
 #include "base/logging.h"
 #include "content/public/common/url_constants.h"
 #include "url/gurl.h"
 
@@ skipping 31 matching lines @@
     return percent_map;
 
   for (OriginMap::iterator it = origin_map_.begin(); it != origin_map_.end();
        ++it) {
     percent_map[it->first] =
         static_cast<int>(it->second * 100 / total_consumed_ + 0.5);
   }
   return percent_map;
 }
 
+scoped_ptr<OriginPowerMap::Subscription>
+OriginPowerMap::AddPowerConsumptionUpdatedCallback(
+    const base::Closure& callback) {
+  return callback_list_.Add(callback);
+}
+
+void OriginPowerMap::OnAllOriginsUpdated() {
+  callback_list_.Notify();
+}
+
 }  // namespace power