Avoid a thread hop when initializing IPC to new processes

content/browser/child_process_launcher_helper_linux.cc

 // Copyright 2017 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 "base/posix/global_descriptors.h"
 #include "content/browser/child_process_launcher.h"
 #include "content/browser/child_process_launcher_helper.h"
 #include "content/browser/child_process_launcher_helper_posix.h"
 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 #include "content/browser/zygote_host/zygote_communication_linux.h"
@@ skipping 74 matching lines @@
   options->environ = delegate_->GetEnvironment();
   // fds_to_remap will de deleted in AfterLaunchOnLauncherThread() below.
   options->fds_to_remap = fds_to_map.release();
 }
 
 ChildProcessLauncherHelper::Process
 ChildProcessLauncherHelper::LaunchProcessOnLauncherThread(
     const base::LaunchOptions& options,
     std::unique_ptr<FileMappedForLaunch> files_to_register,
     bool* is_synchronous_launch,
-    int* launch_result) {
+    int* launch_result,
+    std::unique_ptr<mojo::edk::PendingProcessConnection>* pending_connection,
+    mojo::edk::ScopedPlatformHandle* server_handle) {
   *is_synchronous_launch = true;
 
   ZygoteHandle* zygote_handle =
       base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoZygote) ?
       nullptr : delegate_->GetZygote();
   if (zygote_handle) {
     // This code runs on the PROCESS_LAUNCHER thread so race conditions are not
     // an issue with the lazy initialization.
     if (*zygote_handle == nullptr) {
       *zygote_handle = CreateZygote();
@@ skipping 61 matching lines @@
 // static
 void ChildProcessLauncherHelper::SetProcessBackgroundedOnLauncherThread(
       base::Process process, bool background) {
   DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
   if (process.CanBackgroundProcesses())
     process.SetProcessBackgrounded(background);
 }
 
 }  // namespace internal
 }  // namespace content