Need to set the MICROSOFT_TABLETPENSERVICE_PROPERTY window property even for child windows

base/win/win_util.cc

Index: base/win/win_util.cc
diff --git a/base/win/win_util.cc b/base/win/win_util.cc
index 87bde159cd5ac0420d3043cd87797cacfaf3f133..7193d40f3597aaf976e80e3321fb51690098e496 100644
--- a/base/win/win_util.cc
+++ b/base/win/win_util.cc
@@ -22,6 +22,8 @@
 #include <signal.h>
 #include <stddef.h>
 #include <stdlib.h>
+#include <tchar.h> // Must be before tpcshrd.h or for any use of _T macro
+#include <tpcshrd.h>
 #include <uiviewsettingsinterop.h>
 #include <windows.ui.viewmanagement.h>
 #include <winstring.h>
@@ -694,5 +696,15 @@ bool GetLoadedModulesSnapshot(HANDLE process, std::vector<HMODULE>* snapshot) {
   return false;
 }
 
+void EnableFlicks(HWND hwnd) {
+  ::RemoveProp(hwnd, MICROSOFT_TABLETPENSERVICE_PROPERTY);
+}
+
+void DisableFlicks(HWND hwnd) {
+  ::SetProp(hwnd, MICROSOFT_TABLETPENSERVICE_PROPERTY,
+      reinterpret_cast<HANDLE>(TABLET_DISABLE_FLICKS |
+          TABLET_DISABLE_FLICKFALLBACKKEYS));
+}
+
 }  // namespace win
 }  // namespace base