Add PeripheralBatteryObserver

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index e94bd9c5e98744e040d0acbeebdccbc8fcf40b94..4d06c87184068ba2bf806e95a5256be67271432f 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -57,6 +57,7 @@
 #include "chrome/browser/chromeos/net/network_portal_detector.h"
 #include "chrome/browser/chromeos/power/brightness_observer.h"
 #include "chrome/browser/chromeos/power/idle_action_warning_observer.h"
+#include "chrome/browser/chromeos/power/peripheral_battery_observer.h"
 #include "chrome/browser/chromeos/power/power_button_observer.h"
 #include "chrome/browser/chromeos/power/resume_observer.h"
 #include "chrome/browser/chromeos/power/screen_lock_observer.h"
@@ -633,6 +634,7 @@ void ChromeBrowserMainPartsChromeos::PostProfileInit() {
         content::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
         "Retail mode");
   }
+  peripheral_battery_observer_.reset(new PeripheralBatteryObserver());
   chromeos::accessibility::Initialize();
 
   storage_monitor_->Init();