Refactor ChildProcess and related classes to create a framework outside of br...

chrome/browser/child_process_launcher.h

-// Copyright (c) 2009 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 CHROME_BROWSER_CHILD_PROCESS_LAUNCHER_H_
-#define CHROME_BROWSER_CHILD_PROCESS_LAUNCHER_H_
-
-#include "base/basictypes.h"
-#include "base/process_util.h"
-#include "base/ref_counted.h"
-
-class CommandLine;
-
-// Launches a process asynchronously and notifies the client of the process
-// handle when it's available.  It's used to avoid blocking the calling thread
-// on the OS since often it can take > 100 ms to create the process.
-class ChildProcessLauncher {
- public:
-  class Client {
-   public:
-    // Will be called on the thread that the ChildProcessLauncher was
-    // constructed on.
-    virtual void OnProcessLaunched() = 0;
-  };
-
-  // Launches the process asynchronously, calling the client when the result is
-  // ready.  Deleting this object before the process is created is safe, since
-  // the callback won't be called.  If the process is still running by the time
-  // this object destructs, it will be terminated.
-  // Takes ownership of cmd_line.
-  ChildProcessLauncher(
-#if defined(OS_WIN)
-      const FilePath& exposed_dir,
-#elif defined(OS_POSIX)
-      bool use_zygote,
-      const base::environment_vector& environ,
-      int ipcfd,
-#endif
-      CommandLine* cmd_line,
-      Client* client);
-  ~ChildProcessLauncher();
-
-  // True if the process is being launched and so the handle isn't available.
-  bool IsStarting();
-
-  // Getter for the process handle.  Only call after the process has started.
-  base::ProcessHandle GetHandle();
-
-  // Call this when the process exits to know if a process crashed or not.
-  bool DidProcessCrash();
-
-  // Changes whether the process runs in the background or not.  Only call
-  // this after the process has started.
-  void SetProcessBackgrounded(bool background);
-
- private:
-  class Context;
-
-  scoped_refptr<Context> context_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
-};
-
-#endif  // CHROME_BROWSER_CHILD_PROCESS_LAUNCHER_H_