Introduce 'grab_inputs' property for athena container.

athena/home/home_card_impl.cc

 // Copyright 2014 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 "athena/home/public/home_card.h"
 
 #include <limits>
 
 #include "athena/common/container_priorities.h"
 #include "athena/home/app_list_view_delegate.h"
@@ skipping 223 matching lines @@
     SetState(VISIBLE_BOTTOM);
   }
 
   virtual void OnOverviewModeExit() OVERRIDE {
     SetState(VISIBLE_MINIMIZED);
   }
 
   // aura::client::ActivationChangeObserver:
   virtual void OnWindowActivated(aura::Window* gained_active,
                                  aura::Window* lost_active) OVERRIDE {
-    if (gained_active != home_card_widget_->GetNativeWindow())
+    if (state_ != HIDDEN &&
+        gained_active != home_card_widget_->GetNativeWindow()) {
       SetState(VISIBLE_MINIMIZED);
+    }
   }
 
   scoped_ptr<AppModelBuilder> model_builder_;
 
   HomeCard::State state_;
 
   // original_state_ is the state which the home card should go back to after
   // the virtual keyboard is hidden.
   HomeCard::State original_state_;
 
@@ skipping 130 matching lines @@
   instance = NULL;
 }
 
 // static
 HomeCard* HomeCard::Get() {
   DCHECK(instance);
   return instance;
 }
 
 }  // namespace athena