Fix taskbar activation

chrome/views/custom_frame_window.cc

 // Copyright (c) 2006-2008 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 "chrome/views/custom_frame_window.h"
 
 #include "base/gfx/point.h"
 #include "base/gfx/size.h"
 #include "base/win_util.h"
 #include "chrome/common/gfx/path.h"
@@ skipping 979 matching lines @@
 
   // We can get WM_NCACTIVATE before we're actually visible. If we're not
   // visible, no need to paint.
   if (IsWindowVisible(GetHWND())) {
     non_client_view_->SchedulePaint();
     // We need to force a paint now, as a user dragging a window will block
     // painting operations while the move is in progress.
     PaintNow(root_view_->GetScheduledPaintRect());
   }
 
-  return TRUE;
+  // Defering to our parent as it is important that the NCActivate message gets
+  // DefProc'ed or the task bar won't show our process as active.
+  // See bug http://crbug.com/4513.
+  return Window::OnNCActivate(active);
 }
 
 LRESULT CustomFrameWindow::OnNCCalcSize(BOOL mode, LPARAM l_param) {
   // We need to repaint all when the window bounds change.
   return WVR_REDRAW;
 }
 
 LRESULT CustomFrameWindow::OnNCHitTest(const CPoint& point) {
   // NC points are in screen coordinates.
   CPoint temp = point;
@@ skipping 291 matching lines @@
   UINT message_flags = 0;
   if ((GetKeyState(VK_CONTROL) & 0x80) == 0x80)
     message_flags |= MK_CONTROL;
   if ((GetKeyState(VK_SHIFT) & 0x80) == 0x80)
     message_flags |= MK_SHIFT;
   message_flags |= flags;
   ProcessMousePressed(temp, message_flags, false, false);
 }
 
 }  // namespace views