Adds ability for chrome to behave as mojo_runner

mojo/shell/background/background_shell.h

 // Copyright 2016 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 MOJO_SHELL_BACKGROUND_BACKGROUND_SHELL_H_
 #define MOJO_SHELL_BACKGROUND_BACKGROUND_SHELL_H_
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/shell/public/interfaces/shell_client.mojom.h"
 
 class GURL;
 
 namespace mojo {
 namespace shell {
 
-struct CommandLineSwitch;
+class NativeRunnerDelegate;
 
 // BackgroundShell starts up the mojo shell on a background thread, and
 // destroys the thread in the destructor. Once created use CreateApplication()
 // to obtain an InterfaceRequest for the Application. The InterfaceRequest can
 // then be bound to an ApplicationImpl.
 class BackgroundShell {
  public:
   BackgroundShell();
   ~BackgroundShell();
 
-  // Starts the background shell. |command_line_switches| are additional
-  // switches applied to any processes spawned by this call.
-  void Init(const std::vector<CommandLineSwitch>& command_line_switches);
+  // Starts the background shell.
+  void Init(NativeRunnerDelegate* native_runner_delegate);
 
   // Obtains an InterfaceRequest for the specified url.
   InterfaceRequest<mojom::ShellClient> CreateShellClientRequest(
       const GURL& url);
 
  private:
   class MojoThread;
 
   scoped_ptr<MojoThread> thread_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundShell);
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_BACKGROUND_BACKGROUND_SHELL_H_