PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_broker_api.h

Index: ppapi/thunk/ppb_broker_api.h
diff --git a/ppapi/thunk/ppb_broker_api.h b/ppapi/thunk/ppb_broker_api.h
index 8703a7b89a724bd06d99c774b0164daeaf0aa0cf..803c99e63c0ad634655781817c7cbda814d1bc80 100644
--- a/ppapi/thunk/ppb_broker_api.h
+++ b/ppapi/thunk/ppb_broker_api.h
@@ -1,21 +1,25 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_PPB_BROKER_API_H_
 #define PPAPI_THUNK_PPB_BROKER_API_H_
 
+#include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_stdint.h"
 
 namespace ppapi {
+
+class TrackedCallback;
+
 namespace thunk {
 
 class PPB_Broker_API {
  public:
   virtual ~PPB_Broker_API() {}
 
-  virtual int32_t Connect(PP_CompletionCallback connect_callback) = 0;
+  virtual int32_t Connect(scoped_refptr<TrackedCallback> connect_callback) = 0;
   virtual int32_t GetHandle(int32_t* handle) = 0;
 };