1 files changed, 7 insertions, 0 deletions
diff --git a/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h b/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h
index 735ff41b55a..5ac6a910055 100644
--- a/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h
+++ b/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h
@@ -28,6 +28,10 @@ class ImageSkia;
 class Rect;
 }  // namespace gfx
 
+namespace ui {
+class PaintContext;
+}  // namespace ui
+
 namespace views {
 namespace corewm {
 class Tooltip;
@@ -198,6 +202,9 @@ class VIEWS_EXPORT DesktopWindowTreeHost {
   // Sets the bounds in screen coordinate DIPs (WindowTreeHost generally
   // operates in pixels). This function is implemented in terms of Screen.
   virtual void SetBoundsInDIP(const gfx::Rect& bounds);
+
+  // Updates window shape by clipping the canvas before paint starts.
+  virtual void UpdateWindowShapeIfNeeded(const ui::PaintContext& context);
 };
 
 }  // namespace views