Implement hit tests/client area.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 6f1fa068f843c5d0fc20469b4be35db1400b76ad..024396aac1997f2312b627a8bf60957c355f4f7f 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -62,6 +62,7 @@
 #include "ui/views/widget/desktop_aura/x11_desktop_window_move_client.h"
 #include "ui/views/widget/desktop_aura/x11_pointer_grab.h"
 #include "ui/views/widget/desktop_aura/x11_window_event_filter.h"
+#include "ui/views/window/native_frame_view.h"
 #include "ui/wm/core/compound_event_filter.h"
 #include "ui/wm/core/window_util.h"
 
@@ -1002,6 +1003,12 @@ void DesktopWindowTreeHostX11::SetVisibilityChangedAnimationsEnabled(
   // Much like the previous NativeWidgetGtk, we don't have anything to do here.
 }
 
+NonClientFrameView* DesktopWindowTreeHostX11::CreateNonClientFrameView() {
+  return ShouldUseNativeFrame()
+             ? new NativeFrameView(native_widget_delegate_->AsWidget())
+             : nullptr;
+}
+
 bool DesktopWindowTreeHostX11::ShouldUseNativeFrame() const {
   return use_native_frame_;
 }