Use inner HWND for accelerated rendering on windows

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 468 matching lines @@
   for (int i = 0; i < infobar_delegate_count(); ++i) {
     InfoBarDelegate* delegate = GetInfoBarDelegateAt(i);
     delegate->InfoBarClosed();
   }
   infobar_delegates_.clear();
 
   // TODO(brettw) this should be moved to the view.
 #if defined(OS_WIN)
   // If we still have a window handle, destroy it. GetNativeView can return
   // NULL if this contents was part of a window that closed.
-  if (GetNativeView())
+  if (GetNativeView()) {
+    RenderViewHost* host = render_view_host();
+    if (host && host->view()) {
+      host->view()->WillWmDestroy();
+    }
     ::DestroyWindow(GetNativeView());
+  }
 #endif
 
   // OnCloseStarted isn't called in unit tests.
   if (!tab_close_start_time_.is_null()) {
     UMA_HISTOGRAM_TIMES("Tab.Close",
         base::TimeTicks::Now() - tab_close_start_time_);
   }
 }
 
 // static
@@ skipping 2734 matching lines @@
 }
 
 void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = CharacterEncoding::GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 void TabContents::SetAppIcon(const SkBitmap& app_icon) {
   app_icon_ = app_icon;
   NotifyNavigationStateChanged(INVALIDATE_TITLE);
 }