Adding a new window type for frameless non-transient top level windows, used by ChromeOS' window ...

views/widget/native_widget_win.cc

 // Copyright (c) 2011 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 "views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 
 #include "base/string_util.h"
 #include "base/system_monitor/system_monitor.h"
@@ skipping 1765 matching lines @@
   if (params.has_dropshadow) {
     class_style |= (base::win::GetVersion() < base::win::VERSION_XP) ?
         0 : CS_DROPSHADOW;
   }
 
   // Set type-dependent style attributes.
   switch (params.type) {
     case Widget::InitParams::TYPE_WINDOW:
     case Widget::InitParams::TYPE_CONTROL:
       break;
+    case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
+      style |= WS_POPUP;
+      break;
     case Widget::InitParams::TYPE_POPUP:
       style |= WS_POPUP;
       ex_style |= WS_EX_TOOLWINDOW;
       break;
     case Widget::InitParams::TYPE_MENU:
       style |= WS_POPUP;
       break;
     default:
       NOTREACHED();
   }
@@ skipping 268 matching lines @@
 
   // And now, notify them that they have a brand new parent.
   for (NativeWidgets::iterator it = widgets.begin();
        it != widgets.end(); ++it) {
     (*it)->GetWidget()->NotifyNativeViewHierarchyChanged(true,
                                                          new_parent);
   }
 }
 
 }  // namespace views