PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_websocket_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_WEBSOCKET_API_H_
 #define PPAPI_THUNK_WEBSOCKET_API_H_
 
+#include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/ppb_websocket.h"
 
 namespace ppapi {
+
+class TrackedCallback;
+
 namespace thunk {
 
 // Some arguments and attributes are based on The WebSocket Protocol and The
 // WebSocket API. See also following official specifications.
 //  - The WebSocket Protocol http://tools.ietf.org/html/rfc6455
 //  - The WebSocket API      http://dev.w3.org/html5/websockets/
 class PPB_WebSocket_API {
  public:
   virtual ~PPB_WebSocket_API() {}
 
   // Connects to the specified WebSocket server with |protocols| argument
   // defined by the WebSocket API. Returns an int32_t error code from
   // pp_errors.h.
   virtual int32_t Connect(PP_Var url,
                           const PP_Var protocols[],
                           uint32_t protocol_count,
-                          PP_CompletionCallback callback) = 0;
+                          scoped_refptr<TrackedCallback> callback) = 0;
 
   // Closes the established connection with specified |code| and |reason|.
   // Returns an int32_t error code from pp_errors.h.
   virtual int32_t Close(uint16_t code,
                         PP_Var reason,
-                        PP_CompletionCallback callback) = 0;
+                        scoped_refptr<TrackedCallback> callback) = 0;
 
   // Receives a message from the WebSocket server. Caller must keep specified
   // |message| object as valid until completion callback is invoked. Returns an
   // int32_t error code from pp_errors.h.
   virtual int32_t ReceiveMessage(PP_Var* message,
-                                 PP_CompletionCallback callback) = 0;
+                                 scoped_refptr<TrackedCallback> callback) = 0;
 
   // Sends a message to the WebSocket server. Returns an int32_t error code
   // from pp_errors.h.
   virtual int32_t SendMessage(PP_Var message) = 0;
 
   // Returns the bufferedAmount attribute of The WebSocket API.
   virtual uint64_t GetBufferedAmount() = 0;
 
   // Returns the CloseEvent code attribute of The WebSocket API. Returned code
   // is valid if the connection is already closed and wasClean attribute is
@@ skipping 19 matching lines @@
   virtual PP_WebSocketReadyState GetReadyState() = 0;
 
   // Returns the url attribute of The WebSocket API.
   virtual PP_Var GetURL() = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_WEBSOCKET_API_H_