Make the App Info Dialog appear modal

ui/app_list/views/app_list_view.h

Index: ui/app_list/views/app_list_view.h
diff --git a/ui/app_list/views/app_list_view.h b/ui/app_list/views/app_list_view.h
index 03129774b83d77f39cd5647ffd644aeff9728179..f288e060e567a6dcccbbcbc44cb32c2e29ef33cd 100644
--- a/ui/app_list/views/app_list_view.h
+++ b/ui/app_list/views/app_list_view.h
@@ -76,6 +76,10 @@ class APP_LIST_EXPORT AppListView : public views::BubbleDelegateView,
 
   void UpdateBounds();
 
+  // Enables/disables a semi-transparent overlay over the app list (good for
+  // hiding the app list when a modal dialog is being shown).
+  void SetAppListOverlayVisible(bool visible);
+
   // Returns true if the app list should be centered and in landscape mode.
   bool ShouldCenterWindow() const;
 
@@ -149,6 +153,10 @@ class APP_LIST_EXPORT AppListView : public views::BubbleDelegateView,
   SigninView* signin_view_;
   SpeechView* speech_view_;
 
+  // A semi-transparent white overlay that covers the app list while dialogs are
+  // open.
+  views::View* overlay_view_;
+
   ObserverList<AppListViewObserver> observers_;
   scoped_ptr<HideViewAnimationObserver> animation_observer_;