WebSocket Pepper API: allow to release in completion callbacks

webkit/plugins/ppapi/ppb_websocket_impl.cc

 // 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.
 
 #include "webkit/plugins/ppapi/ppb_websocket_impl.h"
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 484 matching lines @@
   close_was_clean_ = was_clean ? PP_TRUE : PP_FALSE;
 
   // Update buffered_amount_.
   buffered_amount_ = unhandled_buffered_amount;
 
   // Handle state transition and invoking callback.
   DCHECK_NE(PP_WEBSOCKETREADYSTATE_CLOSED, state_);
   PP_WebSocketReadyState state = state_;
   state_ = PP_WEBSOCKETREADYSTATE_CLOSED;
 
+  // User handlers may release WebSocket PP_Resource in the following
+  // completion callbacks. Retain |this| here to assure that this object
+  // keep on being valid in this function.
+  scoped_refptr<PPB_WebSocket_Impl> retain_this(this);
   if (state == PP_WEBSOCKETREADYSTATE_CONNECTING)
     TrackedCallback::ClearAndRun(&connect_callback_, PP_ERROR_FAILED);
 
   if (wait_for_receive_) {
     wait_for_receive_ = false;
     receive_callback_var_ = NULL;
     TrackedCallback::ClearAndRun(&receive_callback_, PP_ERROR_FAILED);
   }
 
   if ((state == PP_WEBSOCKETREADYSTATE_CLOSING) && close_callback_.get())
@@ skipping 10 matching lines @@
 
   *receive_callback_var_ = received_messages_.front()->GetPPVar();
   received_messages_.pop();
   receive_callback_var_ = NULL;
   wait_for_receive_ = false;
   return PP_OK;
 }
 
 }  // namespace ppapi
 }  // namespace webkit