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

ash/launcher/launcher.h

Index: ash/launcher/launcher.h
diff --git a/ash/launcher/launcher.h b/ash/launcher/launcher.h
index 64a6a47c658eb894e71e4fe9faedd721d34eb563..e79eacbbbeeed3495795aa34cb5e04e98d5bc460 100644
--- a/ash/launcher/launcher.h
+++ b/ash/launcher/launcher.h
@@ -12,6 +12,7 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/size.h"
+#include "ui/views/widget/widget_observer.h"
 
 namespace aura {
 class Window;
@@ -38,7 +39,7 @@ class LauncherIconObserver;
 class LauncherDelegate;
 class LauncherModel;
 
-class ASH_EXPORT Launcher  {
+class ASH_EXPORT Launcher: public views::WidgetObserver  {
  public:
   Launcher(aura::Window* window_container,
            internal::ShelfLayoutManager* shelf_layout_manager);
@@ -119,6 +120,13 @@ class ASH_EXPORT Launcher  {
 
   aura::Window* window_container() { return window_container_; }
 
+  // Called by the activation delegate, before the launcher is activated
+  // when no other windows are visible.
+  void WillActivateAsFallback() { activating_as_fallback_ = true; }
+
+  // Overridden from views::WidgetObserver:
+  void OnWidgetActivationChanged(views::Widget* widget, bool active);
+
  private:
   class DelegateView;
 
@@ -146,6 +154,9 @@ class ASH_EXPORT Launcher  {
   // Used to animate the background.
   internal::BackgroundAnimator background_animator_;
 
+  // Used then activation is forced from the activation delegate.
+  bool activating_as_fallback_;
+
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };