Whitelist IME extenions for app.window with type:panel

extensions/common/constants.cc

Index: extensions/common/constants.cc
diff --git a/extensions/common/constants.cc b/extensions/common/constants.cc
index cfd00c117e3d122b47446a2ee346370dad802811..a481dcdcb6abad4a1799ab1b6cb1d5b04d9937de 100644
--- a/extensions/common/constants.cc
+++ b/extensions/common/constants.cc
@@ -81,4 +81,7 @@ const char* const kHangoutsExtensionIds[6] = {
     // Keep in sync with _api_features.json and _manifest_features.json.
 };
 
+const char* const kIMEExtensionIds[2] = {"gjaehgfemfahhmlgpdfknkhdnemmolop",
+                                         "jkghodnilhceideoidjikpgommlajknk"};
+
 }  // namespace extension_misc