Forward WM_VSCROLL and WM_HSCROLL messages from the LegacyRenderWidgetHostHWND class to its parent.

content/browser/renderer_host/legacy_render_widget_host_win.cc

Index: content/browser/renderer_host/legacy_render_widget_host_win.cc
diff --git a/content/browser/renderer_host/legacy_render_widget_host_win.cc b/content/browser/renderer_host/legacy_render_widget_host_win.cc
index f2ebbee105ed728a519ba63cb023b09bec5bed6c..f512c5d123a322b65b191cab01033fbbbe7fe886 100644
--- a/content/browser/renderer_host/legacy_render_widget_host_win.cc
+++ b/content/browser/renderer_host/legacy_render_widget_host_win.cc
@@ -204,6 +204,12 @@ LRESULT LegacyRenderWidgetHostHWND::OnTouch(UINT message,
   return ::SendMessage(GetParent(), message, w_param, l_param);
 }
 
+LRESULT LegacyRenderWidgetHostHWND::OnScroll(UINT message,
+                                             WPARAM w_param,
+                                             LPARAM l_param) {
+  return ::SendMessage(GetParent(), message, w_param, l_param);
+}
+
 LRESULT LegacyRenderWidgetHostHWND::OnNCPaint(UINT message,
                                               WPARAM w_param,
                                               LPARAM l_param) {