Use the force_software_compositing flag in the Widget::InitParams structure instead of the TYPE_MEN…

ui/views/widget/widget_hwnd_utils.cc

 // Copyright (c) 2012 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 "ui/views/widget/widget_hwnd_utils.h"
 
 #include <dwmapi.h>
 
 #include "base/command_line.h"
 #include "base/win/windows_version.h"
@@ skipping 45 matching lines @@
   // user32 and the DMW. If things are set up just right DMW gets out of the
   // way; it does not create a backbuffer and simply blends our D3D surface
   // and the desktop background. The handshake is as follows:
   // 1- Use D3D9Ex to create device/swapchain, etc. You need D3DFMT_A8R8G8B8.
   // 2- The window must have WS_EX_COMPOSITED in the extended style.
   // 3- The window must have WS_POPUP in its style.
   // 4- The windows must not have WM_SIZEBOX, WS_THICKFRAME or WS_CAPTION in its
   //    style.
   // 5- When the window is created but before it is presented, call
   //    DwmExtendFrameIntoClientArea passing -1 as the margins.
+  // We also set the WS_EX_COMPOSITED style for software composited translucent
+  // windows, which ensures that they are updated via the layered window code
+  // path in the software compositor.
   if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW) {
-    if (ui::win::IsAeroGlassEnabled())
+    if (ui::win::IsAeroGlassEnabled() || params.force_software_compositing)
       *ex_style |= WS_EX_COMPOSITED;
   }
   if (params.shadow_type == Widget::InitParams::SHADOW_TYPE_DROP) {
     *class_style |= (base::win::GetVersion() < base::win::VERSION_XP) ?
         0 : CS_DROPSHADOW;
   }
 
   // Set type-dependent style attributes.
   switch (params.type) {
     case Widget::InitParams::TYPE_PANEL:
@@ skipping 81 matching lines @@
   DWORD class_style = 0;
   CalculateWindowStylesFromInitParams(params, widget_delegate,
                                       native_widget_delegate, &style, &ex_style,
                                       &class_style);
   handler->set_initial_class_style(class_style);
   handler->set_window_style(handler->window_style() | style);
   handler->set_window_ex_style(handler->window_ex_style() | ex_style);
 }
 
 }  // namespace views