Block incognito browser windows for voice interaction.

ui/snapshot/snapshot_aura.h

Index: ui/snapshot/snapshot_aura.h
diff --git a/ui/snapshot/snapshot_aura.h b/ui/snapshot/snapshot_aura.h
index 425dcf6c363224df3128272cf9eef8f2be234fa4..2c5429cef1d192837bf116fb630f087d52a36137 100644
--- a/ui/snapshot/snapshot_aura.h
+++ b/ui/snapshot/snapshot_aura.h
@@ -9,6 +9,8 @@
 
 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.
@@ -25,6 +27,16 @@ SNAPSHOT_EXPORT void GrabWindowSnapshotAsyncAura(
     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_