Fix crash bug of IME extension API.

chromeos/dbus/ibus/ibus_engine_service.h

 // Copyright (c) 2012 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 CHROMEOS_DBUS_IBUS_IBUS_ENGINE_SERVICE_H_
 #define CHROMEOS_DBUS_IBUS_IBUS_ENGINE_SERVICE_H_
 
 #include <string>
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_vector.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/dbus/dbus_client_implementation_type.h"
 
 namespace dbus {
 class Bus;
 class ObjectPath;
 }  // namespace dbus
 
 namespace chromeos {
 
 // TODO(nona): Remove ibus namespace after complete libibus removal.
 namespace ibus {
 class IBusLookupTable;
 class IBusProperty;
 class IBusText;
 typedef ScopedVector<IBusProperty> IBusPropertyList;
 }  // namespace
 
-// A interface to handle the engine client method call.
+// A interface to handle the engine handler method call.
 class CHROMEOS_EXPORT IBusEngineHandlerInterface {
  public:
   typedef base::Callback<void (bool consumed)> KeyEventDoneCallback;
 
   // Following capability mask is introduced from
   // http://ibus.googlecode.com/svn/docs/ibus-1.4/ibus-ibustypes.html#IBusCapabilite
   // TODO(nona): Move to ibus_contants and merge one in ui/base/ime/*
   enum IBusCapability {
     IBUS_CAPABILITY_PREEDIT_TEXT = 1U,
     IBUS_CAPABILITY_FOCUS = 8U,
@@ skipping 82 matching lines @@
  public:
   // Following value should be same in
   // http://ibus.googlecode.com/svn/docs/ibus-1.4/ibus-ibustypes.html#IBusPreeditFocusMode
   enum IBusEnginePreeditFocusOutMode {
     IBUS_ENGINE_PREEEDIT_FOCUS_OUT_MODE_CLEAR = 0,
     IBUS_ENGINE_PREEEDIT_FOCUS_OUT_MODE_COMMIT = 1,
   };
 
   virtual ~IBusEngineService();
 
-  // Initializes the engine client. This class takes the ownership of |handler|.
-  virtual void Initialize(IBusEngineHandlerInterface* handler) = 0;
+  // Sets a new IBus engine handler and old handler will be overridden.
+  // This class doesn't take the ownership of |handler|.
+  virtual void SetEngine(IBusEngineHandlerInterface* handler) = 0;
+
+  // Unsets the current IBus engine hanlder.
+  virtual void UnsetEngine() = 0;
 
   // Emits RegisterProperties signal.
   virtual void RegisterProperties(
       const ibus::IBusPropertyList& property_list) = 0;
   // Emits UpdatePreedit signal.
   virtual void UpdatePreedit(const ibus::IBusText& ibus_text,
                              uint32 cursor_pos,
                              bool is_visible,
                              IBusEnginePreeditFocusOutMode mode) = 0;
   // Emits UpdateAuxiliaryText signal.
@@ skipping 22 matching lines @@
   // Create() should be used instead.
   IBusEngineService();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(IBusEngineService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_IBUS_IBUS_ENGINE_SERVICE_H_