Fixes the timing to dispatch VKEY_PROCESSKEY.

ui/base/ime/input_method_auralinux.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_IME_INPUT_METHOD_AURALINUX_H_
 #define UI_BASE_IME_INPUT_METHOD_AURALINUX_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/ime/input_method_base.h"
 #include "ui/base/ime/linux/linux_input_method_context.h"
@@ skipping 27 matching lines @@
   virtual void OnPreeditChanged(const CompositionText& composition_text)
       OVERRIDE;
   virtual void OnPreeditEnd() OVERRIDE;
   virtual void OnPreeditStart() OVERRIDE;
 
  protected:
   // Overridden from InputMethodBase.
   virtual void OnDidChangeFocusedClient(TextInputClient* focused_before,
                                         TextInputClient* focused) OVERRIDE;
 
+ private:
+  // Allows to fire a VKEY_PROCESSKEY key event.
+  void AllowToFireProcessKey(const ui::KeyEvent& event);
+  // Fires a VKEY_PROCESSKEY key event if allowed.
+  void MaybeFireProcessKey();
+  // Stops firing VKEY_PROCESSKEY key events.
+  void StopFiringProcessKey();
+
   scoped_ptr<LinuxInputMethodContext> input_method_context_;
 
+  // IBus in async mode eagerly consumes all the key events first regardless of
+  // whether the underlying IME consumes the key event or not, and makes
+  // gtk_im_context_filter_keypress() always return true, and later pushes
+  // the key event back to the GDK event queue when it turns out that the
+  // underlying IME doesn't consume the key event.
+  //
+  // Thus we have to defer a decision whether or not to dispatch a
+  // VKEY_PROCESSKEY key event.  Unlike other InputMethod's subclasses,
+  // DispatchKeyEvent() in this class does not directly dispatch a
+  // VKEY_PROCESSKEY event, OnCommit or OnPreedit{Start,Changed,End} dispatch
+  // a VKEY_PROCESSKEY event instead.
+  //
+  // Because of this hack, there could be chances that we accidentally dispatch
+  // VKEY_PROCESSKEY events and other key events in out of order.
+  //
+  // |allowed_to_fire_vkey_process_key_| is used not to dispatch a
+  // VKEY_PROCESSKEY event twice for a single key event.
+  bool allowed_to_fire_vkey_process_key_;
+  int vkey_processkey_flags_;
+
   DISALLOW_COPY_AND_ASSIGN(InputMethodAuraLinux);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_AURALINUX_H_