Chromium side of maxTouchPoints implementation.

ui/base/touch/touch_device_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/base/touch/touch_device.h"
 #include "base/win/windows_version.h"
 #include <windows.h>
 
 namespace ui {
 
 bool IsTouchDevicePresent() {
   int value = GetSystemMetrics(SM_DIGITIZER);
   return (value & NID_READY) &&
       ((value & NID_INTEGRATED_TOUCH) || (value & NID_EXTERNAL_TOUCH));
 }
 
+int MaxTouchPoints() {
+  return GetSystemMetrics(SM_MAXIMUMTOUCHES);
+}
+
 }  // namespace ui