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..0a967b912fa97d2bef955b85924bb1e35f8d2c3d 100644
--- a/ui/events/keycodes/keyboard_code_conversion.cc
+++ b/ui/events/keycodes/keyboard_code_conversion.cc
@@ -428,6 +428,22 @@ bool DomCodeToControlCharacter(DomCode dom_code,
   }
 }
 
+DomKey CharacterToDomKey(base::char16 character) {
+  switch (character) {
+    case 0x08:
+      return DomKey::BACKSPACE;
+    case 0x09:
+      return DomKey::TAB;
+    case 0x0A:
+    case 0x0D:

[Wez, 2015/05/06 23:51:53]

Do we really want to map both of these to Enter? That means we're losing
information on the exact input event? :-S

[kpschoedel, 2015/05/07 16:21:33]

Done.

+      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) {