Use Mojo pipes to signal sync IPC events

ppapi/nacl_irt/irt_ppapi.cc

 // 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.
 
 #include "build/build_config.h"
 // Need to include this before most other files because it defines
 // IPC_MESSAGE_LOG_ENABLED. We need to use it to define
 // IPC_MESSAGE_MACROS_LOG_ENABLED so ppapi_messages.h will generate the
 // ViewMsgLog et al. functions.
 
 #include <stdint.h>
 
 #include "base/threading/thread.h"
 #include "ipc/ipc_logging.h"
+#include "mojo/edk/embedder/embedder.h"
 #include "ppapi/nacl_irt/irt_interfaces.h"
 #include "ppapi/nacl_irt/irt_ppapi.h"
 #include "ppapi/nacl_irt/plugin_startup.h"
 #include "ppapi/nacl_irt/ppapi_dispatcher.h"
 #include "ppapi/nacl_irt/public/irt_ppapi.h"
 #include "ppapi/proxy/plugin_globals.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 
 static struct PP_StartFunctions g_pp_functions;
 
 void PpapiPluginRegisterThreadCreator(
     const struct PP_ThreadFunctions* thread_functions) {
   // Initialize all classes that need to create threads that call back into
   // user code.
   ppapi::PPB_Audio_Shared::SetThreadFunctions(thread_functions);
 }
 
 int irt_ppapi_start(const struct PP_StartFunctions* funcs) {
   g_pp_functions = *funcs;
 
+  mojo::edk::Init();

[Mark Seaborn, 2016/06/14 19:30:21]

It looks like you're doing this twice, once here and once in StartUpPlugin() in
ppapi/nacl_irt/plugin_startup.cc.  Only once should be necessary.

[Ken Rockot(use gerrit already), 2016/06/14 20:17:03]

Oops, removed from here

+
   base::MessageLoop loop;
   ppapi::proxy::PluginGlobals plugin_globals(
       scoped_refptr<base::TaskRunner>(ppapi::GetIOThread()->task_runner()));
 
   ppapi::PpapiDispatcher ppapi_dispatcher(
       ppapi::GetIOThread()->task_runner(), ppapi::GetShutdownEvent(),
       ppapi::GetBrowserIPCFileDescriptor(),
       ppapi::GetRendererIPCFileDescriptor());
   plugin_globals.SetPluginProxyDelegate(&ppapi_dispatcher);
 
@@ skipping 12 matching lines @@
 }
 
 const void* PPP_GetInterface(const char* interface_name) {
   return g_pp_functions.PPP_GetInterface(interface_name);
 }
 
 const struct nacl_irt_ppapihook nacl_irt_ppapihook = {
   irt_ppapi_start,
   PpapiPluginRegisterThreadCreator,
 };