Set ui::KeyEvent::key_ (DOM Level 3 key) under X11.

ui/events/keycodes/keyboard_code_conversion_x.cc

Index: ui/events/keycodes/keyboard_code_conversion_x.cc
diff --git a/ui/events/keycodes/keyboard_code_conversion_x.cc b/ui/events/keycodes/keyboard_code_conversion_x.cc
index 48025c436939994b5fe2ebf9186a973182966adb..a73d03f970fd494a9bce47d68a5746e4ac4fc893 100644
--- a/ui/events/keycodes/keyboard_code_conversion_x.cc
+++ b/ui/events/keycodes/keyboard_code_conversion_x.cc
@@ -19,6 +19,7 @@
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/events/keycodes/dom4/keycode_converter.h"
+#include "ui/events/keycodes/keyboard_code_conversion_xkb.h"
 #include "ui/events/x/keysym_to_unicode.h"
 
 #define VKEY_UNSUPPORTED VKEY_UNKNOWN
@@ -899,6 +900,23 @@ uint16 GetCharacterFromXEvent(const XEvent* xev) {
   return GetUnicodeCharacterFromXKeySym(keysym);
 }
 
+void GetMeaningFromXEvent(const XEvent* xev, DomKey* key, base::char16* ch) {
+  XEvent xkeyevent = {0};
+  const XKeyEvent* xkey = NULL;
+  if (xev->type == GenericEvent) {
+    // Convert the XI2 key event into a core key event so that we can
+    // continue to use XLookupString() until crbug.com/367732 is complete.
+    InitXKeyEventFromXIDeviceEvent(*xev, &xkeyevent);
+    xkey = &xkeyevent.xkey;
+  } else {
+    xkey = &xev->xkey;
+  }
+  KeySym keysym = XK_VoidSymbol;
+  XLookupString(const_cast<XKeyEvent*>(xkey), NULL, 0, &keysym, NULL);
+  *ch = GetUnicodeCharacterFromXKeySym(keysym);
+  *key = XKeySymToDomKey(keysym, *ch);
+}
+
 KeyboardCode DefaultKeyboardCodeFromHardwareKeycode(
     unsigned int hardware_code) {
   // This function assumes that X11 is using evdev-based keycodes.