Implement hit tests/client area.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
index 710c322b2ada6a0681a8393df7b4b5bf831db69c..bc22f26e90290a9172f2a038761c80d9b6c5c81c 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
@@ -39,6 +39,7 @@ class XScopedEventSelector;
 namespace views {
 class DesktopDragDropClientAuraX11;
 class DesktopWindowTreeHostObserverX11;
+class NonClientFrameView;
 class X11DesktopWindowMoveClient;
 
 class VIEWS_EXPORT DesktopWindowTreeHostX11
@@ -137,6 +138,7 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
       Widget::MoveLoopEscapeBehavior escape_behavior) override;
   void EndMoveLoop() override;
   void SetVisibilityChangedAnimationsEnabled(bool value) override;
+  NonClientFrameView* CreateNonClientFrameView() override;
   bool ShouldUseNativeFrame() const override;
   bool ShouldWindowContentsBeTransparent() const override;
   void FrameTypeChanged() override;