linux/cros: Supports XKeyEvent to Unicode conversion independent from user's locale.

ui/events/x/keysym_to_unicode.h

+// Copyright 2014 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_EVENTS_X_KEYSYM_TO_UNICODE_H_
+#define UI_EVENTS_X_KEYSYM_TO_UNICODE_H_
+
+#include <cstdint>
+
+namespace ui {
+
+// Returns a Unicode character corresponding to the given |keysym|.  If the
+// |keysym| doesn't represent a printable character, returns zero.  We don't
+// support characters outside the Basic Plane, and this function returns zero
+// in that case.
+uint16_t GetUnicodeCharacterFromXKeySym(unsigned long keysym);
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_X_KEYSYM_TO_UNICODE_H_