chromeos: Add power supply info reading capability

chrome/browser/chromeos/net/network_change_notifier_chromeos.cc

Index: chrome/browser/chromeos/net/network_change_notifier_chromeos.cc
diff --git a/chrome/browser/chromeos/net/network_change_notifier_chromeos.cc b/chrome/browser/chromeos/net/network_change_notifier_chromeos.cc
index 44b560478fa8a001ac4e2da06eb76db8404d11a2..75e688a73f8652b90088469ea796f9abbc942929 100644
--- a/chrome/browser/chromeos/net/network_change_notifier_chromeos.cc
+++ b/chrome/browser/chromeos/net/network_change_notifier_chromeos.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
+#include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
@@ -84,9 +85,9 @@ NetworkChangeNotifierChromeos::~NetworkChangeNotifierChromeos() {
   lib->RemoveNetworkManagerObserver(this);
   lib->RemoveObserverForAllNetworks(this);
 
-  chromeos::PowerLibrary* power =
-      chromeos::CrosLibrary::Get()->GetPowerLibrary();
-  power->RemoveObserver(this);
+  chromeos::CrosLibrary::Get()->GetPowerLibrary()->RemoveObserver(this);
+  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()
+      ->RemoveObserver(this);
 }
 
 void NetworkChangeNotifierChromeos::Init() {
@@ -94,7 +95,8 @@ void NetworkChangeNotifierChromeos::Init() {
       chromeos::CrosLibrary::Get()->GetNetworkLibrary();
   network_library->AddNetworkManagerObserver(this);
 
-  chromeos::CrosLibrary::Get()->GetPowerLibrary()
+  chromeos::CrosLibrary::Get()->GetPowerLibrary()->AddObserver(this);
+  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()
       ->AddObserver(this);
 
   UpdateNetworkState(network_library);