diff -r 000000000000 -r 6474c204b198 editor/idl/nsIEditorIMESupport.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/idl/nsIEditorIMESupport.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "domstubs.idl"
+
+%{C++
+namespace mozilla {
+namespace widget {
+struct IMEState;
+} // namespace widget
+} // namespace mozilla
+%}
+
+native IMEState(mozilla::widget::IMEState);
+
+[scriptable, uuid(0ba7f490-afb8-46dd-87fc-bc6137fbc899)]
+
+interface nsIEditorIMESupport : nsISupports
+{
+  /**
+   * forceCompositionEnd() force the composition end
+   */
+
+  void forceCompositionEnd();
+
+  /**
+   * Get preferred IME status of current widget.
+   */
+
+  [noscript] IMEState getPreferredIMEState();
+
+  /**
+   * whether this editor has active IME transaction
+   */
+  readonly attribute boolean composing;
+};
+