Forward WM_NCHITTEST messages from the LegacyRenderWidgetHostHWND class to the parent window.

content/browser/renderer_host/legacy_render_widget_host_win.h

Index: content/browser/renderer_host/legacy_render_widget_host_win.h
diff --git a/content/browser/renderer_host/legacy_render_widget_host_win.h b/content/browser/renderer_host/legacy_render_widget_host_win.h
index f356c8f819627dfff4d82dce174f99f7328d6744..12e513e95242fe9ae1c5493cb39e521d5cc3f01d 100644
--- a/content/browser/renderer_host/legacy_render_widget_host_win.h
+++ b/content/browser/renderer_host/legacy_render_widget_host_win.h
@@ -73,6 +73,9 @@ class CONTENT_EXPORT LegacyRenderWidgetHostHWND
     MESSAGE_HANDLER_EX(WM_TOUCH, OnTouch)
     MESSAGE_HANDLER_EX(WM_VSCROLL, OnScroll)
     MESSAGE_HANDLER_EX(WM_HSCROLL, OnScroll)
+    MESSAGE_HANDLER_EX(WM_NCHITTEST, OnNCHitTest)
+    MESSAGE_RANGE_HANDLER(WM_NCMOUSEMOVE, WM_NCXBUTTONDBLCLK,
+                          OnMouseRange)
   END_MSG_MAP()
 
   HWND hwnd() { return m_hWnd; }
@@ -116,6 +119,7 @@ class CONTENT_EXPORT LegacyRenderWidgetHostHWND
   LRESULT OnMouseActivate(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnTouch(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnScroll(UINT message, WPARAM w_param, LPARAM l_param);
+  LRESULT OnNCHitTest(UINT message, WPARAM w_param, LPARAM l_param);
 
   LRESULT OnNCPaint(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnPaint(UINT message, WPARAM w_param, LPARAM l_param);