Don't activate a window if screen is locked.

ash/wm/activation_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/activation_controller.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/window_modality_controller.h"
 #include "ash/wm/window_util.h"
@@ skipping 22 matching lines @@
          window->id() == kShellWindowId_ModalContainer ||
          window->id() == kShellWindowId_LockScreenContainer ||
          window->id() == kShellWindowId_LockModalContainer;
 }
 
 // Returns true if |window| can be activated or deactivated.
 // A window manager typically defines some notion of "top level window" that
 // supports activation/deactivation.
 bool CanActivateWindow(aura::Window* window) {
   return window &&
-      window->IsVisible() &&
+      window->CanReceiveEvents() &&

[sky, 2012/01/12 21:11:36]

One downside of this is that if the lock screen is up, this will return false,
which will prevent the window from coming to the front so that when the lock
screen goes away it is deactivated. Maybe we should move the window to the front
but not activate it.

[oshima, 2012/01/12 21:32:50]

good point. done.

       (!aura::client::GetActivationDelegate(window) ||
         aura::client::GetActivationDelegate(window)->ShouldActivate(NULL)) &&
       SupportsChildActivation(window->parent());
 }
 
 // When a modal window is activated, we bring its entire transient parent chain
 // to the front. This function must be called before the modal transient is
 // stacked at the top to ensure correct stacking order.
 void StackTransientParentsBelowModalWindow(aura::Window* window) {
   if (window->GetIntProperty(aura::client::kModalKey) != ui::MODAL_TYPE_WINDOW)
@@ skipping 150 matching lines @@
        i != container->children().rend();
        ++i) {
     if (*i != ignore && CanActivateWindow(*i))
       return *i;
   }
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace ash