Added quick lock mechanism while in Touchview

chrome/browser/chromeos/power/power_button_observer.cc

Index: chrome/browser/chromeos/power/power_button_observer.cc
diff --git a/chrome/browser/chromeos/power/power_button_observer.cc b/chrome/browser/chromeos/power/power_button_observer.cc
index 8a74caeb0448f3ce2ec215889b85ac9a635e07d6..e7a27180f2dd82c9227fee2fe952dc8d4f80237e 100644
--- a/chrome/browser/chromeos/power/power_button_observer.cc
+++ b/chrome/browser/chromeos/power/power_button_observer.cc
@@ -15,6 +15,10 @@
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "content/public/browser/notification_service.h"
 
+namespace ash {
+class LockStateControllerDelegate;
+}
+
 namespace chromeos {
 
 namespace {
@@ -30,7 +34,8 @@ ash::user::LoginStatus GetCurrentLoginStatus() {
 
 PowerButtonObserver::PowerButtonObserver() {
   ash::Shell::GetInstance()->lock_state_controller()->
-      SetDelegate(new SessionStateControllerDelegateChromeos);
+      SetDelegate(scoped_ptr<ash::LockStateControllerDelegate>(
+          new SessionStateControllerDelegateChromeos));
 
   registrar_.Add(
       this,