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;
 }
 
+void OriginPowerMap::AddObserver(OriginPowerMapObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void OriginPowerMap::RemoveObserver(OriginPowerMapObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void OriginPowerMap::OnPowerConsumptionUpdated() {
+  FOR_EACH_OBSERVER(
+      OriginPowerMapObserver, observers_, OnPowerConsumptionUpdated());
+}
+
 }  // namespace power