Implement hit tests/client area.

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index a6647e9ee9284ff5a1a58648eb025534903c39d0..80edf9522cc24c9099f2126f7925afa9587b23ce 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -36,6 +36,7 @@
 #include "ui/views/win/fullscreen_handler.h"
 #include "ui/views/win/hwnd_message_handler.h"
 #include "ui/views/win/hwnd_util.h"
+#include "ui/views/window/native_frame_view.h"
 #include "ui/wm/core/compound_event_filter.h"
 #include "ui/wm/core/window_animations.h"
 #include "ui/wm/public/scoped_tooltip_disabler.h"
@@ -414,6 +415,11 @@ void DesktopWindowTreeHostWin::SetVisibilityChangedAnimationsEnabled(
   content_window_->SetProperty(aura::client::kAnimationsDisabledKey, !value);
 }
 
+NonClientFrameView* DesktopWindowTreeHostWin::CreateNonClientFrameView() {
+  return ShouldUseNativeFrame() ?
+      new NativeFrameView(native_widget_delegate_->AsWidget()) : nullptr;
+}
+
 bool DesktopWindowTreeHostWin::ShouldUseNativeFrame() const {
   return IsTranslucentWindowOpacitySupported();
 }