Allow closing root window, or pressing the power button to shutdown ash_shell, and chrome /w chrome…

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 73c1a3bbbafbd8155db17c41bbf708ec6b40763b..12ff6149c92713b1c7e45c988408fcf9bc603d8d 100644
--- a/ash/wm/power_button_controller.cc
+++ b/ash/wm/power_button_controller.cc
@@ -6,6 +6,7 @@
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
+#include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/cursor_manager.h"
 #include "base/command_line.h"
@@ -472,6 +473,12 @@ void PowerButtonController::OnRootWindowResized(const aura::RootWindow* root,
     background_layer_->SetBounds(gfx::Rect(root->bounds().size()));
 }
 
+void PowerButtonController::OnRootWindowHostClosed(const aura::RootWindow*) {

[Daniel Erat, 2012/08/07 23:35:17]

nit: Doesn't need to happen in this change, but this method should be renamed to
more accurately reflect when it's actually called.  It looks like it only gets
invoked in response to a WM_DELETE_WINDOW message from an X window manager, so
something like OnRootWindowHostCloseRequested() would probably be better.

+  if(Shell::GetInstance() && Shell::GetInstance()->delegate()) {

[sky, 2012/08/07 23:14:08]

no {}

+    Shell::GetInstance()->delegate()->Exit();
+  }
+}
+
 bool PowerButtonController::LoggedInAsNonGuest() const {
   if (login_status_ == user::LOGGED_IN_NONE)
     return false;