PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_instance_api.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 PPAPI_THUNK_INSTANCE_API_H_
 #define PPAPI_THUNK_INSTANCE_API_H_
 
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "ppapi/c/dev/pp_print_settings_dev.h"
 #include "ppapi/c/dev/ppb_console_dev.h"
 #include "ppapi/c/dev/ppb_text_input_dev.h"
 #include "ppapi/c/dev/ppb_url_util_dev.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_size.h"
 #include "ppapi/c/pp_time.h"
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/c/ppb_instance.h"
 #include "ppapi/c/ppb_mouse_cursor.h"
 #include "ppapi/c/private/ppb_instance_private.h"
 #include "ppapi/shared_impl/api_id.h"
 
 // Windows headers interfere with this file.
 #ifdef PostMessage
 #undef PostMessage
 #endif
 
 namespace ppapi {
 
+class TrackedCallback;
 struct ViewData;
 
 namespace thunk {
 
 class PPB_Flash_API;
 
 class PPB_Instance_API {
  public:
   virtual ~PPB_Instance_API() {}
 
@@ skipping 62 matching lines @@
   virtual void PostMessage(PP_Instance instance, PP_Var message) = 0;
 
   // Mouse cursor.
   virtual PP_Bool SetCursor(PP_Instance instance,
                             PP_MouseCursor_Type type,
                             PP_Resource image,
                             const PP_Point* hot_spot) = 0;
 
   // MouseLock.
   virtual int32_t LockMouse(PP_Instance instance,
-                            PP_CompletionCallback callback) = 0;
+                            scoped_refptr<TrackedCallback> callback) = 0;
   virtual void UnlockMouse(PP_Instance instance) = 0;
 
   // Printing.
   virtual PP_Bool GetDefaultPrintSettings(
       PP_Instance instance,
       PP_PrintSettings_Dev* print_settings) = 0;
 
   // TextInput.
   virtual void SetTextInputType(PP_Instance instance,
                                 PP_TextInput_Type type) = 0;
@@ skipping 27 matching lines @@
                                       PP_URLComponents_Dev* components) = 0;
 #endif  // !defined(OS_NACL)
 
   static const ApiID kApiID = API_ID_PPB_INSTANCE;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_INSTANCE_API_H_