In Windows desktop Chrome AURA the HandleVisibilityChanged function on the HWNDMessageHandlerDelega…

ui/views/widget/desktop_aura/desktop_root_window_host_win.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/desktop_aura/desktop_root_window_host_win.h"
 
 #include "base/win/metro.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 363 matching lines @@
   message_handler_->FlashFrame(flash_frame);
 }
 
 void DesktopRootWindowHostWin::OnNativeWidgetFocus() {
   // HWNDMessageHandler will perform the proper updating on its own.
 }
 
 void DesktopRootWindowHostWin::OnNativeWidgetBlur() {
 }
 
+void DesktopRootWindowHostWin::AlwaysPaintActivated(bool value) {
+  ::DefWindowProc(message_handler_->hwnd(), WM_NCACTIVATE, !!value, 0);

[Ben Goodger (Google), 2013/04/19 16:17:03]

Seems like this could have side effects.

We implement this differently for NativeWidgetWin/HWNDMessageHandler. Can we
replicate that here?

[ananta, 2013/04/19 18:21:26]

I had looked into DefWindowProc of WM_NCACTIVATE in a past life :) and can
safely say that the only sideeffect is the WM_GETTEXT message which is sent in
the context of this call to get the text to be displayed in the caption bar.

Regarding duplicating the implementation of NativeWidgetWin here, we are doing
the same thing in the DesktopRootwindowHostWin class. As mentioned in the CL
description, the reason this works is because the bubble view is displayed
without grabbing activation.

[sky, 2013/04/23 14:15:54]

I share Ben's worry about this. Isn't there an official way to force painting
the frame?

+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostWin, RootWindowHost implementation:
 
 
 void DesktopRootWindowHostWin::SetDelegate(
     aura::RootWindowHostDelegate* delegate) {
   root_window_host_delegate_ = delegate;
 }
 
 aura::RootWindow* DesktopRootWindowHostWin::GetRootWindow() {
@@ skipping 463 matching lines @@
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura,
     const gfx::Rect& initial_bounds) {
   return new DesktopRootWindowHostWin(native_widget_delegate,
                                       desktop_native_widget_aura,
                                       initial_bounds);
 }
 
 }  // namespace views