Add code attribute into onKeyEvent argument.

chrome/browser/extensions/api/input_ime/input_ime_api.cc

Index: chrome/browser/extensions/api/input_ime/input_ime_api.cc
diff --git a/chrome/browser/extensions/api/input_ime/input_ime_api.cc b/chrome/browser/extensions/api/input_ime/input_ime_api.cc
index 357fe671cf4c573520a37cbc3072ddd3bddeeac6..018b9e178326fbc90b0fe58db7a959fcf5a42859 100644
--- a/chrome/browser/extensions/api/input_ime/input_ime_api.cc
+++ b/chrome/browser/extensions/api/input_ime/input_ime_api.cc
@@ -246,6 +246,7 @@ class ImeObserver : public chromeos::InputMethodEngine::Observer {
     dict->SetString("type", event.type);
     dict->SetString("requestId", request_id);
     dict->SetString("key", event.key);
+    dict->SetString("code", event.code);
     dict->SetBoolean("altKey", event.alt_key);
     dict->SetBoolean("ctrlKey", event.ctrl_key);
     dict->SetBoolean("shiftKey", event.shift_key);