aura-x11: Add support for xmodmap'ed pointer buttons.

ui/base/x/x11_util.h

 // Copyright (c) 2011 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.
 
 #ifndef UI_BASE_X_X11_UTIL_H_
 #define UI_BASE_X_X11_UTIL_H_
 #pragma once
 
 // This file declares utility functions for X11 (Linux only).
 //
@@ skipping 210 matching lines @@
 UI_EXPORT bool ChangeWindowDesktop(XID window, XID destination);
 
 // Enable the default X error handlers. These will log the error and abort
 // the process if called. Use SetX11ErrorHandlers() from x11_util_internal.h
 // to set your own error handlers.
 UI_EXPORT void SetDefaultX11ErrorHandlers();
 
 // Return true if a given window is in full-screen mode.
 UI_EXPORT bool IsX11WindowFullScreen(XID window);
 
+// Returns the mapped button.
+int GetMappedButton(int button);

[sadrul, 2011/12/07 17:06:52]

This is deliberately not exported since it's not used outside of ui at the
moment.

+
+// Updates button mapping. This is usually called when a MappingNotify event is
+// received.
+UI_EXPORT void UpdateButtonMap();
+
 }  // namespace ui
 
 #endif  // UI_BASE_X_X11_UTIL_H_