Block incognito browser windows for voice interaction.

ui/wm/core/window_util.h

Index: ui/wm/core/window_util.h
diff --git a/ui/wm/core/window_util.h b/ui/wm/core/window_util.h
index 1bd9cb8b4969ff5a4ca4700dd743449bb54a8a76..2b48b06e1fa55be11b3508beb8231d3deade20cd 100644
--- a/ui/wm/core/window_util.h
+++ b/ui/wm/core/window_util.h
@@ -6,8 +6,10 @@
 #define UI_WM_CORE_WINDOW_UTIL_H_
 
 #include <memory>
+#include <utility>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "ui/wm/wm_export.h"
 
@@ -46,6 +48,17 @@ WM_EXPORT aura::Window* GetToplevelWindow(aura::Window* window);
 WM_EXPORT std::unique_ptr<ui::LayerTreeOwner> RecreateLayers(
     ui::LayerOwner* root);
 
+using MapLayerFunc =
+    base::Callback<std::unique_ptr<ui::Layer>(ui::LayerOwner*)>;

[sky, 2017/05/17 14:48:30]

RepeatingCallback.

[Muyuan, 2017/05/17 19:25:35]

Done.

+
+// Maps |map_func| over each layer of the layer tree and returns a copy of the
+// layer tree. The recursion stops at the level when |map_func| returns nullptr
+// on the owner's layer. MapLayers might return nullptr when |map_func| returns
+// nullptr on the root layer's owner.
+WM_EXPORT std::unique_ptr<ui::LayerTreeOwner> MapLayers(

[sky, 2017/05/17 14:48:30]

Add test coverage of this.
How about naming this RecreateLayersUsingClosure() or something?

[Muyuan, 2017/05/17 19:25:35]

Done.

+    ui::LayerOwner* root,
+    const MapLayerFunc& map_func);
+
 // Returns a layer tree that mirrors |root|. Used for live window previews. If
 // |sync_bounds| is true, the bounds of all mirror layers except the root are
 // synchronized. See |sync_bounds_| in ui::Layer.