Need to set the MICROSOFT_TABLETPENSERVICE_PROPERTY window property even for child windows

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 156 matching lines @@
 // and provide a fallback path if necessary.
 BASE_EXPORT bool IsUser32AndGdi32Available();
 
 // Takes a snapshot of the modules loaded in the |process|. The returned
 // 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);
 
+// Adds or removes the MICROSOFT_TABLETPENSERVICE_PROPERTY property with the
+// TABLET_DISABLE_FLICKS & TABLET_DISABLE_FLICKFALLBACKKEYS flags in order to
+// disable pen flick gestures for the given HWND.
+BASE_EXPORT void EnableFlicks(HWND hwnd);
+BASE_EXPORT void DisableFlicks(HWND hwnd);
+
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WIN_UTIL_H_