Implement the persistent metro mode setting (win8)

win8/delegate_execute/chrome_util.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 "win8/delegate_execute/chrome_util.h"
 
 #include <atlbase.h>
 #include <shlobj.h>
 #include <windows.h>
 
@@ skipping 246 matching lines @@
   string16 app_id(kAppUserModelId);
   string16 suffix;
   if (IsPerUserInstall(chrome_exe) &&
       !GetUserSpecificRegistrySuffix(&suffix)) {
     AtlTrace("%hs. GetUserSpecificRegistrySuffix failed.\n",
               __FUNCTION__);
   }
   return app_id.append(suffix);
 }
 
+bool IsMachineATablet() {
+  // A tablet by this definition is something that has integrated multi-touch
+  // but is not also pen-enabled. For example a Thinkpad X220 tablet is not
+  // considered a tabled while a Samsum 700T tablet is.
+  const int kPenInput = NID_INTEGRATED_PEN | NID_EXTERNAL_PEN;
+  const int kMultiTouch = NID_INTEGRATED_TOUCH | NID_MULTI_INPUT | NID_READY;
+  int sm = GetSystemMetrics(SM_DIGITIZER);
+  AtlTrace("GetSystemMetrics for SM_DIGITIZER is 0x%x\n", sm);
+  return ((sm & kMultiTouch) == kMultiTouch) && ((sm & kPenInput) == 0);
+}
+
 }  // delegate_execute