Block incognito browser windows for voice interaction.

ui/snapshot/snapshot_aura.h

 // Copyright 2017 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_SNAPSHOT_SNAPSHOT_AURA_H_
 #define UI_SNAPSHOT_SNAPSHOT_AURA_H_
 
 #include "ui/snapshot/snapshot.h"
 
 namespace ui {
 
+class Layer;
+
 // These functions are identical to those in snapshot.h, except they're
 // guaranteed to read the frame using an Aura CopyOutputRequest and not the
 // native windowing system. source_rect and target_size are in DIP.
 
 SNAPSHOT_EXPORT void GrabWindowSnapshotAndScaleAsyncAura(
     aura::Window* window,
     const gfx::Rect& source_rect,
     const gfx::Size& target_size,
     scoped_refptr<base::TaskRunner> background_task_runner,
     const GrabWindowSnapshotAsyncCallback& callback);
 
 SNAPSHOT_EXPORT void GrabWindowSnapshotAsyncAura(
     aura::Window* window,
     const gfx::Rect& source_rect,
     const GrabWindowSnapshotAsyncCallback& callback);
 
+using GrabLayerSnapshotCallback =
+    base::Callback<void(const gfx::Image& snapshot)>;
+
+// Grabs a snapshot of a |layer| and all its descendants.
+// |source_rect| is the bounds of the snapshot content relative to |layer|.
+SNAPSHOT_EXPORT void GrabLayerSnapshotAsync(
+    Layer* layer,
+    const gfx::Rect& source_rect,
+    const GrabLayerSnapshotCallback& callback);
+
 }  // namespace ui
 
 #endif  // UI_SNAPSHOT_SNAPSHOT_AURA_H_