Move ZygoteForkDelegateLinux to content/public/app.

content/common/zygote_fork_delegate_linux.h

-// Copyright (c) 2011 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_ZYGOTE_FORK_DELEGATE_LINUX_H_
-#define CONTENT_COMMON_ZYGOTE_FORK_DELEGATE_LINUX_H_
-#pragma once
-
-#include <unistd.h>
-
-#include <string>
-#include <vector>
-
-#include "base/basictypes.h"
-
-// The ZygoteForkDelegate allows the Chrome Linux zygote to delegate
-// fork operations to another class that knows how to do some
-// specialized version of fork.
-class ZygoteForkDelegate {
- public:
-  // A ZygoteForkDelegate is created during Chrome linux zygote
-  // initialization, and provides "fork()" functionality as an
-  // alternative to forking the zygote.  A new delegate is passed in
-  // as an argument to ZygoteMain().
-  ZygoteForkDelegate() {}
-  virtual ~ZygoteForkDelegate() {}
-
-  // Initialization happens in the zygote after it has been
-  // started by ZygoteMain.
-  virtual void Init(bool sandboxed,
-                    int browserdesc,
-                    int sandboxdesc) = 0;
-
-  // After Init, supply a UMA_HISTOGRAM_ENUMERATION the delegate
-  // would like to supply on the first fork.
-  virtual void InitialUMA(std::string* uma_name,
-                          int* uma_sample,
-                          int* uma_boundary_value) = 0;
-
-  // Returns 'true' if the delegate would like to handle a given fork
-  // request.  Otherwise returns false.  Optionally, fills in uma_name et al
-  // with a report the helper wants to make via UMA_HISTOGRAM_ENUMERATION.
-  virtual bool CanHelp(const std::string& process_type, std::string* uma_name,
-                       int* uma_sample, int* uma_boundary_value) = 0;
-
-  // Delegate forks, returning a -1 on failure. Outside the
-  // suid sandbox, Fork() returns the Linux process ID. Inside
-  // the sandbox, returns a positive integer, with PID discovery
-  // handled by the sandbox.
-  virtual pid_t Fork(const std::vector<int>& fds) = 0;
-
-  // After a successful for, signal the child to indicate that
-  // the child's PID has been received. Also communicate the
-  // channel switch as a part of acknowledgement message.
-  virtual bool AckChild(int fd, const std::string& channel_switch) = 0;
-};
-#endif  // CONTENT_COMMON_ZYGOTE_FORK_DELEGATE_LINUX_H_