Do some plumbing.

shell/child_process_host.h

 // 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.
 
 #ifndef SHELL_CHILD_PROCESS_HOST_H_
 #define SHELL_CHILD_PROCESS_HOST_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process/process.h"
 #include "mojo/edk/embedder/channel_info_forward.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "shell/child_controller.mojom.h"
 
 namespace shell {
 
 class Context;
+struct NativeApplicationOptions;
 
 // Child process host: parent-process representation of a child process, which
 // hosts/runs a native Mojo application loaded from the file system. This class
 // handles launching and communicating with the child process.
 //
 // This class is not thread-safe. It should be created/used/destroyed on a
 // single thread.
 class ChildProcessHost {
  public:
   explicit ChildProcessHost(Context* context);
   // TODO(vtl): Virtual because |DidStart()| is, even though it shouldn't be
   // (see |DidStart()|).
   virtual ~ChildProcessHost();
 
   // |Start()|s the child process; calls |DidStart()| (on the thread on which
   // |Start()| was called) when the child has been started (or failed to start).
   // After calling |Start()|, this object must not be destroyed until
   // |DidStart()| has been called.
   // TODO(vtl): Consider using weak pointers and removing this requirement.
   // TODO(vtl): This should probably take a callback instead.
   // TODO(vtl): Consider merging this with |StartApp()|.
-  void Start(bool require_32_bit);
+  void Start(const NativeApplicationOptions& options);
 
   // Waits for the child process to terminate, and returns its exit code.
   // Note: If |Start()| has been called, this must not be called until the
   // callback has been called.
   int Join();
 
   // Methods relayed to the |ChildController|. These methods may be only be
   // called after |Start()|, but may be called immediately (without waiting for
   // |DidStart()|).
 
@@ skipping 29 matching lines @@
   ChildController::StartAppCallback on_app_complete_;
 
   base::Process child_process_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessHost);
 };
 
 }  // namespace shell
 
 #endif  // SHELL_CHILD_PROCESS_HOST_H_