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

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 137 matching lines @@
       TRACKMOUSEEVENT tme;
       tme.cbSize = sizeof(tme);
       tme.dwFlags = TME_LEAVE;
       tme.hwndTrack = hwnd();
       tme.dwHoverTime = 0;
       TrackMouseEvent(&tme);
     }
     w_param = MAKEWPARAM(LOWORD(w_param), SPECIAL_MOUSEMOVE_NOT_TO_BE_TRACKED);
   }
 
-  // The offsets in mouse wheel messages are in screen coordinates. We should
-  // not be converting them to parent coordinates.
-  if (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL) {
+  // The offsets for WM_NCXXX and WM_MOUSEWHEEL and WM_MOUSEHWHEEL messages are
+  // in screen coordinates. We should not be converting them to parent
+  // coordinates.
+  if ((message >= WM_MOUSEFIRST && message <= WM_MOUSELAST) &&
+      (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL)) {
     POINT mouse_coords;
     mouse_coords.x = GET_X_LPARAM(l_param);
     mouse_coords.y = GET_Y_LPARAM(l_param);
     ::MapWindowPoints(hwnd(), GetParent(), &mouse_coords, 1);
     l_param = MAKELPARAM(mouse_coords.x, mouse_coords.y);
   }
   return ::SendMessage(GetParent(), message, w_param, l_param);
 }
 
 LRESULT LegacyRenderWidgetHostHWND::OnMouseLeave(UINT message,
@@ skipping 32 matching lines @@
                                             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::OnNCHitTest(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