adds WARP support to Chromium, for Metro mode only, on Windows 8

chrome/browser/ui/toolbar/wrench_menu_model.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 "chrome/browser/ui/toolbar/wrench_menu_model.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/command_line.h"
@@ skipping 542 matching lines @@
 
   if (!browser_->profile()->IsOffTheRecord()) {
     recent_tabs_sub_menu_model_.reset(new RecentTabsSubMenuModel(provider_,
                                                                  browser_,
                                                                  NULL));
     AddSubMenuWithStringId(IDC_RECENT_TABS_MENU, IDS_RECENT_TABS_MENU,
                            recent_tabs_sub_menu_model_.get());
   }
 
 #if defined(OS_WIN)
- if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
-     content::GpuDataManager::GetInstance()->CanUseGpuBrowserCompositor()) {
+  // Windows 8 can support ASH mode using WARP, but Windows 7 requires a working
+  // GPU compositor.
+  if ((base::win::GetVersion() >= base::win::VERSION_WIN7 &&
+      content::GpuDataManager::GetInstance()->CanUseGpuBrowserCompositor()) ||
+      (base::win::GetVersion() >= base::win::VERSION_WIN8)) {
     if (browser_->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH) {
       // ASH/Metro mode, add the 'Relaunch Chrome in desktop mode'.
       AddSeparator(ui::NORMAL_SEPARATOR);
       AddItemWithStringId(IDC_WIN_DESKTOP_RESTART, IDS_WIN_DESKTOP_RESTART);
     } else {
       // In Windows 8 desktop, add the 'Relaunch Chrome in Windows 8 mode'.
       // In Windows 7 desktop, add the 'Relaunch Chrome in Windows ASH mode'
       AddSeparator(ui::NORMAL_SEPARATOR);
       if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
         AddItemWithStringId(IDC_WIN8_METRO_RESTART, IDS_WIN8_METRO_RESTART);
@@ skipping 207 matching lines @@
                        ->GetZoomPercent();
   }
   zoom_label_ = l10n_util::GetStringFUTF16(
       IDS_ZOOM_PERCENT, base::IntToString16(zoom_percent));
 }
 
 void WrenchMenuModel::OnZoomLevelChanged(
     const content::HostZoomMap::ZoomLevelChange& change) {
   UpdateZoomControls();
 }