Implement hit tests/client area.

ui/views/widget/desktop_aura/desktop_window_tree_host_win.h

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
index 7f1d5d9ca02369007db334ade6f6fa42407f86ed..61cadab2c05dc1f711bbf9c7d1f2f60a7c5844dd 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
@@ -23,6 +23,7 @@ class ScopedTooltipDisabler;
 namespace views {
 class DesktopDragDropClientWin;
 class HWNDMessageHandler;
+class NonClientFrameView;
 
 namespace corewm {
 class TooltipWin;
@@ -89,6 +90,7 @@ class VIEWS_EXPORT DesktopWindowTreeHostWin
       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;