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

content/browser/renderer_host/legacy_render_widget_host_win.cc

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/legacy_render_widget_host_win.h"
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/win/windows_version.h"
 #include "base/win/win_util.h"
@@ skipping 186 matching lines @@
     return MA_NOACTIVATE;
   return MA_ACTIVATE;
 }
 
 LRESULT LegacyRenderWidgetHostHWND::OnTouch(UINT message,
                                             WPARAM w_param,
                                             LPARAM l_param) {
   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) {
   return 0;
 }
 
 LRESULT LegacyRenderWidgetHostHWND::OnPaint(UINT message,
                                             WPARAM w_param,
                                             LPARAM l_param) {
   PAINTSTRUCT ps = {0};
   ::BeginPaint(hwnd(), &ps);
   ::EndPaint(hwnd(), &ps);
   return 0;
 }
 
 LRESULT LegacyRenderWidgetHostHWND::OnSetCursor(UINT message,
                                                 WPARAM w_param,
                                                 LPARAM l_param) {
   return 0;
 }
 
 }  // namespace content