android: Move launcher_android.cc to helper

content/browser/android/child_process_launcher_android.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_BROWSER_ANDROID_CHILD_PROCESS_LAUNCHER_ANDROID_H_
-#define CONTENT_BROWSER_ANDROID_CHILD_PROCESS_LAUNCHER_ANDROID_H_
-
-#include <jni.h>
-
-#include "base/callback.h"
-#include "base/command_line.h"
-#include "base/process/process.h"
-#include "content/public/browser/file_descriptor_info.h"
-
-// Contains the methods either being called from or calling to
-// ChildProcessLauncher.java.
-namespace content {
-
-
-typedef base::Callback<void(base::ProcessHandle, int /* launch result */)>
-    StartChildProcessCallback;
-
-// Starts a process as a child process spawned by the Android ActivityManager.
-// The created process handle is returned to the |callback| on success, 0 is
-// returned if the process could not be created.
-void StartChildProcess(
-    const base::CommandLine::StringVector& argv,
-    int child_process_id,
-    FileDescriptorInfo* files_to_register,
-    const StartChildProcessCallback& callback);
-
-// Stops a child process based on the handle returned from StartChildProcess.
-void StopChildProcess(base::ProcessHandle handle);
-
-bool IsChildProcessOomProtected(base::ProcessHandle handle);
-
-void SetChildProcessInForeground(base::ProcessHandle handle,
-                                 bool in_foreground);
-
-bool RegisterChildProcessLauncher(JNIEnv* env);
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_ANDROID_CHILD_PROCESS_LAUNCHER_ANDROID_H_