[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 770 matching lines @@
   // Therefore, perform only the fallback action.
   GetMeaningFromKeyCode(key_code_, flags(), &key_, &character_);
 #elif defined(USE_X11)
   // When a control key is held, prefer ASCII characters to non ASCII
   // characters in order to use it for shortcut keys.  GetCharacterFromKeyCode
   // returns 'a' for VKEY_A even if the key is actually bound to 'à' in X11.
   // GetCharacterFromXEvent returns 'à' in that case.
   character_ = (IsControlDown() || !native_event()) ?
       GetCharacterFromKeyCode(key_code_, flags()) :
       GetCharacterFromXEvent(native_event());
-  // TODO(kpschoedel): set key_ field for X11.
+  GetMeaningFromKeyCode(key_code_, flags(), &key_, &character_);

[Wez, 2015/04/21 02:25:58]

Not sure what you're trying to do here. GetMeaningFromKeyCode translates from a
Windows VKEY code + flags to a DOM |key| value, and optionally a corresponding
character code.

Under X11 the |key_code_| field is already derived from the X KeySym value, so
we've already lost information - we instead want to map the KeySym -> DOM |key|
directly.

[Habib Virji, 2015/04/29 16:05:18]

There was a following CL: 954943003 that was trying to get the mapping from
KeySym to DomKey https://codereview.chromium.org/954943003/patch/40001/20016

SInce Kevin CL has landed. I will update 954943003 accordingly. This will remain
same.

 #elif defined(USE_OZONE)
   KeyboardCode key_code;
   if (!KeyboardLayoutEngineManager::GetKeyboardLayoutEngine()->Lookup(
       code_, flags(), &key_, &character_, &key_code, &platform_keycode_)) {
     GetMeaningFromKeyCode(key_code_, flags(), &key_, &character_);
   }
 #else
   if (native_event()) {
     DCHECK(EventTypeFromNative(native_event()) == ET_KEY_PRESSED ||
            EventTypeFromNative(native_event()) == ET_KEY_RELEASED);
@@ skipping 179 matching lines @@
                    gfx::PointF(x, y),
                    time_stamp,
                    flags | EF_FROM_TOUCH),
       details_(details) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 }  // namespace ui