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. If allow == true, then the
+// property is removed from the HWND else the property is added.
+BASE_EXPORT void AllowFlicks(HWND hwnd, bool allow);

[sky, 2016/04/07 17:57:54]

AllowFlicks with a boolean parameter named allow is rather confusing. I vote for
two functions: EnableFlicks and DisableFlicks

[kylix_rd, 2016/04/07 18:46:25]

Done.

[kylix_rd, 2016/04/07 18:46:25]

I'd rather this have been a method on a common base between the
HWNDMessageHandler & LegacyRenderWidgetHostHWND. At that point it would have
been a "property" of the class and the method would have been something like
HWNDBase::setAllowFlicks(bool allow){}.

Alas, that's not the case so the consolidation into a single function is causing
some confusion.

I'll be happy to break it into separate functions.

+
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WIN_UTIL_H_