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 7180918fad16767c395100ed8ad40bc578a51c7e..e8f020aab491c1ee599ef44cc7f1dd739071c3af 100644
--- a/ui/app_list/views/app_list_view.h
+++ b/ui/app_list/views/app_list_view.h
@@ -75,6 +75,11 @@ class APP_LIST_EXPORT AppListView : public views::BubbleDelegateView,
 
   void UpdateBounds();
 
+  // When called with |visible| = true, displays a semi-transparent overlay over
+  // the app list (good for hiding the app list when a modal dialog is being
+  // shown). Call again with |visible| = false to hide.
+  void ShowAppListOverlay(bool visible);
+
   // Returns true if the app list should be centered and in landscape mode.
   bool ShouldCenterWindow() const;
 
@@ -147,6 +152,10 @@ 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. NULL if it hasn't been created yet.
+  views::View* overlay_view_;
+
   ObserverList<AppListViewObserver> observers_;
   scoped_ptr<HideViewAnimationObserver> animation_observer_;