Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_messaging.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_messaging.cc
===================================================================
--- ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_messaging.cc	(revision 0)
+++ ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_messaging.cc	(revision 0)
@@ -0,0 +1,49 @@
+// Copyright (c) 2011 The Native Client 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 "native_client/src/shared/ppapi_proxy/plugin_ppb_messaging.h"
+
+#include "native_client/src/include/nacl_scoped_ptr.h"
+#include "native_client/src/include/portability.h"
+#include "native_client/src/shared/ppapi_proxy/object_serialize.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "native_client/src/shared/srpc/nacl_srpc.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_var.h"
+#include "srpcgen/ppb_rpc.h"
+
+namespace ppapi_proxy {
+
+namespace {
+
+void PostMessage(PP_Instance instance, struct PP_Var message) {
+  DebugPrintf("PPB_Messaging::PostMessage: instance=%"NACL_PRIu32"\n",
+              instance);
+  if (!ppapi_proxy::PPBCoreInterface()->IsMainThread())
+    return;  // Only supported on main thread.
+
+  uint32_t message_length = kMaxVarSize;
+  nacl::scoped_array<char> message_bytes(Serialize(&message, 1,
+                                                   &message_length));
+  NaClSrpcError srpc_result =
+      PpbMessagingRpcClient::PPB_Messaging_PostMessage(
+          GetMainSrpcChannel(),
+          instance,
+          message_length,
+          message_bytes.get());
+  DebugPrintf("PPB_Messaging::PostMessage: %s\n",
+              NaClSrpcErrorString(srpc_result));
+}
+
+}  // namespace
+
+const PPB_Messaging* PluginMessaging::GetInterface() {
+  static const PPB_Messaging  messaging_interface = {
+    PostMessage
+  };
+  return &messaging_interface;
+}
+
+}  // namespace ppapi_proxy