chromeos: Add power supply info reading capability

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 0a0c600d3f1d9bf618b2e82f61b53d5d7094fc9c..850ee9feb0ba625e8d0db77e2db9140304b7f573 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/chromeos/boot_times_loader.h"
 #include "chrome/browser/chromeos/brightness_observer.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
+#include "chrome/browser/chromeos/cros/power_library.h"
 #include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
 #include "chrome/browser/chromeos/dbus/session_manager_client.h"
 #include "chrome/browser/chromeos/login/session_manager_observer.h"
@@ -88,6 +89,10 @@ ChromeBrowserMainPartsChromeos::~ChromeBrowserMainPartsChromeos() {
     chromeos::DBusThreadManager::Get()->power_manager_client()->RemoveObserver(
         brightness_observer_.get());
   }
+  chromeos::PowerManagerClient::Observer* power_lib =
+      chromeos::CrosLibrary::Get()->GetPowerLibrary();
+  chromeos::DBusThreadManager::Get()->power_manager_client()->
+      RemoveObserver(power_lib);
 
   chromeos::DBusThreadManager::Shutdown();
 
@@ -144,10 +149,11 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopStart() {
   chromeos::DBusThreadManager::Initialize();
 
   // Initialize the brightness observer so that we'll display an onscreen
-  // indication of brightness changes during login.
+  // indication of brightness changes.
   brightness_observer_.reset(new chromeos::BrightnessObserver());
   chromeos::DBusThreadManager::Get()->power_manager_client()->AddObserver(
       brightness_observer_.get());
+
   // Initialize the session manager observer so that we'll take actions
   // per signals sent from the session manager.
   session_manager_observer_.reset(new chromeos::SessionManagerObserver);
@@ -158,4 +164,10 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopStart() {
   if (parsed_command_line().HasSwitch(switches::kEnableBluetooth)) {
     chromeos::BluetoothManager::Initialize();
   }
+
+  // Probe for power supply status.
+  chromeos::PowerManagerClient::Observer* power_lib =
+      chromeos::CrosLibrary::Get()->GetPowerLibrary();
+  chromeos::DBusThreadManager::Get()->power_manager_client()->
+      AddObserver(power_lib);
 }