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

ui/events/keycodes/keyboard_code_conversion.cc

Index: ui/events/keycodes/keyboard_code_conversion.cc
diff --git a/ui/events/keycodes/keyboard_code_conversion.cc b/ui/events/keycodes/keyboard_code_conversion.cc
index e31512b8c5e90efa0e642faead98db3f4f8cbf52..3fc17a162e936e504cb2c1943ceea4b5cd808496 100644
--- a/ui/events/keycodes/keyboard_code_conversion.cc
+++ b/ui/events/keycodes/keyboard_code_conversion.cc
@@ -428,6 +428,21 @@ bool DomCodeToControlCharacter(DomCode dom_code,
   }
 }
 
+DomKey CharacterToDomKey(uint32 character) {
+  switch (character) {
+    case 0x08:
+      return DomKey::BACKSPACE;
+    case 0x09:
+      return DomKey::TAB;
+    case 0x0D:
+      return DomKey::ENTER;
+    case 0x1B:
+      return DomKey::ESCAPE;
+    default:
+      return DomKey::CHARACTER;
+  }
+}
+
 // Returns a Windows-based VKEY for a non-printable DOM Level 3 |key|.
 // The returned VKEY is non-positional (e.g. VKEY_SHIFT).
 KeyboardCode NonPrintableDomKeyToKeyboardCode(DomKey dom_key) {