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

ash/launcher/launcher.cc

Index: ash/launcher/launcher.cc
diff --git a/ash/launcher/launcher.cc b/ash/launcher/launcher.cc
index f38b5675e6e571d0fe64de33fbee610c3dc85072..c32eed21b06bb9f178a3b9cacfd304971cdf7799 100644
--- a/ash/launcher/launcher.cc
+++ b/ash/launcher/launcher.cc
@@ -19,6 +19,7 @@
 #include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/window_properties.h"
 #include "grit/ash_resources.h"
+#include "ui/aura/client/activation_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
@@ -68,9 +69,16 @@ class Launcher::DelegateView : public views::WidgetDelegate,
     return View::GetWidget();
   }
   virtual bool CanActivate() const OVERRIDE {
-    // We don't want mouse clicks to activate us, but we need to allow
-    // activation when the user is using the keyboard (FocusCycler).
-    return focus_cycler_ && focus_cycler_->widget_activating() == GetWidget();
+    // Allow to activate as fallback.
+    if (launcher_->activating_as_fallback_ &&
+        Shell::GetInstance()->delegate()->IsSpokenFeedbackEnabled()) {
+      return true;
+    }
+    // Allow to activate from the focus cycler.
+    if (focus_cycler_ && focus_cycler_->widget_activating() == GetWidget())
+      return true;
+    // Disallow activating in other cases, especially when using mouse.
+    return false;
   }
 
   // BackgroundAnimatorDelegate overrides:
@@ -204,7 +212,8 @@ Launcher::Launcher(aura::Window* window_container,
       delegate_view_(new DelegateView(this)),
       launcher_view_(NULL),
       alignment_(SHELF_ALIGNMENT_BOTTOM),
-      background_animator_(delegate_view_, 0, kLauncherBackgroundAlpha) {
+      background_animator_(delegate_view_, 0, kLauncherBackgroundAlpha),
+      activating_as_fallback_(false) {
   model_.reset(new LauncherModel);
   delegate_.reset(
       Shell::GetInstance()->delegate()->CreateLauncherDelegate(model_.get()));
@@ -234,9 +243,12 @@ Launcher::Launcher(aura::Window* window_container,
   gfx::Size pref =
       static_cast<views::View*>(launcher_view_)->GetPreferredSize();
   widget_->SetBounds(gfx::Rect(pref));
+
+  widget_->AddObserver(this);
 }
 
 Launcher::~Launcher() {
+  widget_->RemoveObserver(this);
 }
 
 // static
@@ -375,6 +387,15 @@ void Launcher::SetWidgetBounds(const gfx::Rect bounds) {
     dimmer_->SetBounds(bounds);
 }
 
+void Launcher::OnWidgetActivationChanged(views::Widget* widget, bool active) {
+  activating_as_fallback_ = false;
+  if (active) {
+    delegate_view_->SetPaneFocusAndFocusDefault();
+  } else {
+    delegate_view_->GetFocusManager()->ClearFocus();
+  }
+}
+
 internal::LauncherView* Launcher::GetLauncherViewForTest() {
   return launcher_view_;
 }