Use ChannelMojo for the utility process.

content/common/child_process_host_impl.h

 // 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.
 
 #ifndef CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
 #define CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 61 matching lines @@
   //
   // Never returns MemoryDumpManager::kInvalidTracingProcessId.
   // Returns only ChildProcessHost::kBrowserTracingProcessId in single-process
   // mode.
   static uint64_t ChildProcessUniqueIdToTracingProcessId(int child_process_id);
 
   // ChildProcessHost implementation
   bool Send(IPC::Message* message) override;
   void ForceShutdown() override;
   std::string CreateChannel() override;
+  std::string CreateChannelMojo(const std::string& child_token) override;
   bool IsChannelOpening() override;
   void AddFilter(IPC::MessageFilter* filter) override;
 #if defined(OS_POSIX)
   base::ScopedFD TakeClientFileDescriptor() override;
 #endif
 
  private:
   friend class ChildProcessHost;
 
   explicit ChildProcessHostImpl(ChildProcessHostDelegate* delegate);
@@ skipping 10 matching lines @@
                               base::SharedMemoryHandle* handle);
   void OnAllocateGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                  uint32_t width,
                                  uint32_t height,
                                  gfx::BufferFormat format,
                                  gfx::BufferUsage usage,
                                  gfx::GpuMemoryBufferHandle* handle);
   void OnDeletedGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                 const gpu::SyncToken& sync_token);
 
+  // Initializes the IPC channel and returns true on success. |channel_| must be
+  // non-null.
+  bool InitChannel();
+
   ChildProcessHostDelegate* delegate_;
   base::Process peer_process_;
   bool opening_channel_;  // True while we're waiting the channel to be opened.
   std::unique_ptr<IPC::Channel> channel_;
   std::string channel_id_;
 
   // Holds all the IPC message filters.  Since this object lives on the IO
   // thread, we don't have a IPC::ChannelProxy and so we manage filters
   // manually.
   std::vector<scoped_refptr<IPC::MessageFilter> > filters_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_