Focus launcher if spoken feedback is enabled and no other windows visible.

ash/wm/ash_activation_controller.h

Index: ash/wm/ash_activation_controller.h
diff --git a/ash/wm/ash_activation_controller.h b/ash/wm/ash_activation_controller.h
index 0e9be46659c9d8b7bd7a36d4ddee1298fb86e080..c3961f9a80fa07b5354c44d2c0921f4c747fa9f5 100644
--- a/ash/wm/ash_activation_controller.h
+++ b/ash/wm/ash_activation_controller.h
@@ -5,6 +5,7 @@
 #ifndef ASH_WM_ASH_ACTIVATION_CONTROLLER_H_
 #define ASH_WM_ASH_ACTIVATION_CONTROLLER_H_
 
+#include "ash/ash_export.h"
 #include "ash/wm/activation_controller_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/basictypes.h"
@@ -12,7 +13,7 @@
 namespace ash {
 namespace internal {
 
-class AshActivationController : public ActivationControllerDelegate {
+class ASH_EXPORT AshActivationController : public ActivationControllerDelegate {
  public:
   AshActivationController();
   virtual ~AshActivationController();
@@ -22,6 +23,11 @@ class AshActivationController : public ActivationControllerDelegate {
   virtual aura::Window* WillActivateWindow(aura::Window* window) OVERRIDE;
   virtual aura::Window* WillFocusWindow(aura::Window* window) OVERRIDE;
 
+  // Returns a handle to the launcher on the active root window which will
+  // be activated as fallback. Also notifies the launcher, so it can return
+  // true from Launcher::CanActivate().
+  aura::Window* PrepareToActivateLauncher();
+
   DISALLOW_COPY_AND_ASSIGN(AshActivationController);
 };