chromeos/aura: Handle power button on unofficial hardware.

ash/wm/power_button_controller.cc

Index: ash/wm/power_button_controller.cc
diff --git a/ash/wm/power_button_controller.cc b/ash/wm/power_button_controller.cc
index 2c720dbc21652bd21e15b419de1309c2928e5508..f18c1e0d46efee0c68d0e3df721c0063f9793d8e 100644
--- a/ash/wm/power_button_controller.cc
+++ b/ash/wm/power_button_controller.cc
@@ -340,6 +340,7 @@ void PowerButtonController::OnLockStateChange(bool locked) {
     lock_timer_.Stop();
     lock_fail_timer_.Stop();
 
+#if !defined(CHROMEOS_LEGACY_POWER_BUTTON)
     if (power_button_down_) {
       lock_to_shutdown_timer_.Stop();
       lock_to_shutdown_timer_.Start(
@@ -347,6 +348,7 @@ void PowerButtonController::OnLockStateChange(bool locked) {
           base::TimeDelta::FromMilliseconds(kLockToShutdownTimeoutMs),
           this, &PowerButtonController::OnLockToShutdownTimeout);
     }
+#endif
   } else {
     StartAnimation(ALL_BUT_SCREEN_LOCKER_AND_RELATED_CONTAINERS,
                    ANIMATION_RESTORE);
@@ -372,6 +374,21 @@ void PowerButtonController::OnPowerButtonEvent(
   if (shutting_down_)
     return;
 
+#if defined(CHROMEOS_LEGACY_POWER_BUTTON)
+  // If power button releases won't get reported correctly because we're not
+  // running on official hardware, just lock the screen or shut down
+  // immediately.
+  if (down) {
+    ShowBackgroundLayer();
+    if (logged_in_as_non_guest_ && !locked_) {
+      StartAnimation(ALL_BUT_SCREEN_LOCKER_AND_RELATED_CONTAINERS,
+                     ANIMATION_SLOW_CLOSE);
+      OnLockTimeout();
+    } else {
+      OnShutdownTimeout();
+    }
+  }
+#else
   if (down) {
     // If we already have a pending request to lock the screen, wait.
     if (lock_fail_timer_.IsRunning())
@@ -401,6 +418,7 @@ void PowerButtonController::OnPowerButtonEvent(
     shutdown_timer_.Stop();
     lock_to_shutdown_timer_.Stop();
   }
+#endif
 }
 
 void PowerButtonController::OnLockButtonEvent(