[KeyboardEvent] Add embedder APIs to translate between Dom |key| enum and strings

ui/events/event.cc

 // 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.
 
 #include "ui/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/extensions/XInput2.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
@@ skipping 820 matching lines @@
   return key_;
 }
 
 base::char16 KeyEvent::GetCharacter() const {
   // Determination of character_ and key_ may be done lazily.
   if (key_ == DomKey::NONE)
     ApplyLayout();
   return character_;
 }
 
+int KeyEvent::GetDomKeyOrCharacter() const {
+  // Determination of character_ and key_ may be done lazily.
+  base::char16 dom_char = GetCharacter();
+  ui::DomKey dom_key = GetDomKey();
+  if (dom_key == DomKey::CHARACTER)
+    return dom_char + static_cast<int>(DomKey::CHARACTER);
+  else
+    return static_cast<int>(dom_key);
+}
+
 base::char16 KeyEvent::GetText() const {
   if ((flags() & EF_CONTROL_DOWN) != 0) {
     base::char16 character;
     ui::DomKey key;
     ui::KeyboardCode key_code;
     if (DomCodeToControlCharacter(code_, flags(), &key, &character, &key_code))
       return character;
   }
   return GetUnmodifiedText();
 }
@@ skipping 122 matching lines @@
                    gfx::PointF(x, y),
                    time_stamp,
                    flags | EF_FROM_TOUCH),
       details_(details) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 }  // namespace ui