Need to set the MICROSOFT_TABLETPENSERVICE_PROPERTY window property even for child windows

base/win/win_util.h

Index: base/win/win_util.h
diff --git a/base/win/win_util.h b/base/win/win_util.h
index b261ce7b5eae91dd12f826e124b552be92a18b44..77d31c80eb8dce1eac4252f025c679994a11704e 100644
--- a/base/win/win_util.h
+++ b/base/win/win_util.h
@@ -174,6 +174,12 @@ BASE_EXPORT bool IsUser32AndGdi32Available();
 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