PPAPI: Make PPP_MessageHandler work in PNaCl

ppapi/c/dev/ppb_messaging_deprecated.h

+/* Copyright 2014 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_C_DEV_IMPL_PPB_MESSAGING_DEPRECATED_H_
+#define PPAPI_C_DEV_IMPL_PPB_MESSAGING_DEPRECATED_H_
+
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/c/pp_var.h"
+
+/* dev, deprecated */
+#define PPB_MESSAGING_INTERFACE_1_1_DEPRECATED "PPB_Messaging;1.1"
+
+/**
+ * This file defines a dev-channel-only API, PPB_Messaging;1.1 that is
+ * deprecated, but which still should provide ABI compatibility for a little
+ * bit longer to give time to transition off of it. The header is *not* provided
+ * in ppapi/c/ppb_messaging.h, in order to push clients to the new API,
+ * version 1.2.
+ * TODO(dmichael): Delete this API altogether when all uses are gone.
+ *                 crbug.com/414398
+ */
+struct PPP_MessageHandler_0_1_Deprecated { /* dev */
+  void (*HandleMessage)(PP_Instance instance,
+                        void* user_data,
+                        struct PP_Var message);
+  struct PP_Var (*HandleBlockingMessage)(PP_Instance instance,
+                                void* user_data,
+                                struct PP_Var message);
+  void (*Destroy)(PP_Instance instance, void* user_data);
+};
+
+struct PPB_Messaging_1_1_Deprecated { /* dev */
+  void (*PostMessage)(PP_Instance instance, struct PP_Var message);
+  int32_t (*RegisterMessageHandler)(
+      PP_Instance instance,
+      void* user_data,
+      const struct PPP_MessageHandler_0_1_Deprecated* handler,
+      PP_Resource message_loop);
+  void (*UnregisterMessageHandler)(PP_Instance instance);
+};
+
+#endif  /* PPAPI_C_DEV_IMPL_PPB_MESSAGING_DEPRECATED_H_ */
+