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

[sadrul, 2012/08/07 13:29:03]

Is this change to make sure chrome terminates if the host window is closed by
the user? Can this cause problems if the host-window is closing because chrome
is already terminating?

[Harry McCleave, 2012/08/07 18:30:14]

In its current form the host window doesn't actually close, the event that
triggers this is the user clicking the 'x' to close the host window but this
event is ignored, this change causes the application to exit at that point,
though perhaps isn't the correct way to do so?

[sadrul, 2012/08/07 22:13:24]

If the user terminates chrome from within chrome (e.g. pressing ctrl-shift-q),
will this code trigger? If it does, will this cause problems?

+  }
+}
+
 bool PowerButtonController::LoggedInAsNonGuest() const {
   if (login_status_ == user::LOGGED_IN_NONE)
     return false;