Convert UtilityProcessHost to bootstrap Mojo Channel using the Shell connection

content/common/child_process_host_impl.cc

 // 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.
 
 #include "content/common/child_process_host_impl.h"
 
 #include <limits>
 
 #include "base/atomic_sequence_num.h"
 #include "base/command_line.h"
@@ skipping 128 matching lines @@
   mojo::ScopedMessagePipeHandle host_handle =
       mojo::edk::CreateParentMessagePipe(channel_id_, child_token);
   channel_ = IPC::ChannelMojo::Create(std::move(host_handle),
                                       IPC::Channel::MODE_SERVER, this);
   if (!channel_ || !InitChannel())
     return std::string();
 
   return channel_id_;
 }
 
+bool ChildProcessHostImpl::CreateChannelMojoWithBootstrap(
+    mojo::ScopedMessagePipeHandle handle) {
+  channel_ = IPC::ChannelMojo::Create(std::move(handle),
+                                      IPC::Channel::MODE_SERVER, this);
+  return channel_ && InitChannel();
+}
+
 std::string ChildProcessHostImpl::CreateChannel() {
   DCHECK(channel_id_.empty());
   channel_id_ = IPC::Channel::GenerateVerifiedChannelID(std::string());
   channel_ = IPC::Channel::CreateServer(channel_id_, this);
   if (!channel_ || !InitChannel())
     return std::string();
 
   return channel_id_;
 }
 
@@ skipping 194 matching lines @@
 }
 
 void ChildProcessHostImpl::OnDeletedGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gpu::SyncToken& sync_token) {
   // Note: Nothing to do here as ownership of shared memory backed
   // GpuMemoryBuffers is passed with IPC.
 }
 
 }  // namespace content