Export the tablet mode checking function from base.

base/win/win_util.h

 // 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.
 
 // =============================================================================
 // PLEASE READ
 //
 // In general, you should not be adding stuff to this file.
 //
 // - If your thing is only used in one place, just put it in a reasonable
@@ skipping 105 matching lines @@
 // exit(), abort(), _exit(), ExitProcess()) and convert them into crashes.
 // Note that not all mechanisms for terminating the process are covered by
 // this. In particular, TerminateProcess() is not caught.
 BASE_EXPORT void SetShouldCrashOnProcessDetach(bool crash);
 BASE_EXPORT bool ShouldCrashOnProcessDetach();
 
 // Adjusts the abort behavior so that crash reports can be generated when the
 // process is aborted.
 BASE_EXPORT void SetAbortBehaviorForCrashReporting();
 
+// Checks whether the supplied |hwnd| is in Windows 10 tablet mode. Will return
+// false on versions below 10.
+BASE_EXPORT bool IsWindows10TabletMode(HWND hwnd);
+
 // A tablet is a device that is touch enabled and also is being used
 // "like a tablet". This is used by the following:-
 // 1. Metrics:- To gain insight into how users use Chrome.
 // 2. Physical keyboard presence :- If a device is in tablet mode, it means
 //    that there is no physical keyboard attached.
 // This function optionally sets the |reason| parameter to determine as to why
 // or why not a device was deemed to be a tablet.
 // Returns true if the device is in tablet mode.
 BASE_EXPORT bool IsTabletDevice(std::string* reason);
 
@@ skipping 35 matching lines @@
 // HMODULEs are not add-ref'd, so they should not be closed and may be
 // invalidated at any time (should a module be unloaded). |process| requires
 // the PROCESS_QUERY_INFORMATION and PROCESS_VM_READ permissions.
 BASE_EXPORT bool GetLoadedModulesSnapshot(HANDLE process,
                                           std::vector<HMODULE>* snapshot);
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WIN_UTIL_H_