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 365 matching lines @@
   message_handler_->FlashFrame(flash_frame);
 }
 
 void DesktopRootWindowHostWin::OnNativeWidgetFocus() {
   // HWNDMessageHandler will perform the proper updating on its own.
 }
 
 void DesktopRootWindowHostWin::OnNativeWidgetBlur() {
 }
 
+void DesktopRootWindowHostWin::SetInactiveRenderingDisabled(
+    bool disable_inactive) {
+  ::DefWindowProc(message_handler_->hwnd(),

[sky, 2013/04/23 21:25:59]

Add a description as to why this is safe.

[ananta, 2013/04/23 21:32:28]

Done.

+                  WM_NCACTIVATE,
+                  !!disable_inactive,
+                  0);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // 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