Block incognito browser windows for voice interaction.

ui/wm/core/window_util.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_WM_CORE_WINDOW_UTIL_H_
 #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"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class Layer;
 class LayerOwner;
@@ skipping 18 matching lines @@
 
 // Returns the existing Layer for |root| (and all its descendants) and creates
 // a new layer for |root| and all its descendants. This is intended for
 // animations that want to animate between the existing visuals and a new state.
 //
 // As a result of this |root| has freshly created layers, meaning the layers
 // have not yet been painted to.
 WM_EXPORT std::unique_ptr<ui::LayerTreeOwner> RecreateLayers(
     ui::LayerOwner* root);
 
+using MapLayerFunc =
+    base::RepeatingCallback<std::unique_ptr<ui::Layer>(ui::LayerOwner*)>;
+
+// 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> RecreateLayersWithClosure(
+    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.
 WM_EXPORT std::unique_ptr<ui::LayerTreeOwner> MirrorLayers(
     ui::LayerOwner* root, bool sync_bounds);
 
 // Convenience functions that get the TransientWindowManager for the window and
 // redirect appropriately. These are preferable to calling functions on
 // TransientWindowManager as they handle the appropriate NULL checks.
 WM_EXPORT aura::Window* GetTransientParent(aura::Window* window);
 WM_EXPORT const aura::Window* GetTransientParent(
     const aura::Window* window);
 WM_EXPORT const std::vector<aura::Window*>& GetTransientChildren(
     const aura::Window* window);
 WM_EXPORT void AddTransientChild(aura::Window* parent, aura::Window* child);
 WM_EXPORT void RemoveTransientChild(aura::Window* parent, aura::Window* child);
 
 // Returns true if |window| has |ancestor| as a transient ancestor. A transient
 // ancestor is found by following the transient parent chain of the window.
 WM_EXPORT bool HasTransientAncestor(const aura::Window* window,
                                     const aura::Window* ancestor);
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_WINDOW_UTIL_H_