Revert of Turn components/crash into a layered component.

components/crash/content/browser/crash_handler_host_linux.h

-// Copyright 2013 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 COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_HANDLER_HOST_LINUX_H_
-#define COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_HANDLER_HOST_LINUX_H_
-
-#include <sys/types.h>
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/files/file_path.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "base/threading/sequenced_worker_pool.h"
-
-namespace base {
-class Thread;
-}
-
-namespace breakpad {
-
-struct BreakpadInfo;
-
-// This is the host for processes which run breakpad inside the sandbox on
-// Linux or Android. We perform the crash dump from the browser because it
-// allows us to be outside the sandbox.
-//
-// Processes signal that they need to be dumped by sending a datagram over a
-// UNIX domain socket. All processes of the same type share the client end of
-// this socket which is installed in their descriptor table before exec.
-class CrashHandlerHostLinux : public base::MessageLoopForIO::Watcher,
-                              public base::MessageLoop::DestructionObserver {
- public:
-  CrashHandlerHostLinux(const std::string& process_type,
-                        const base::FilePath& dumps_path,
-                        bool upload);
-  ~CrashHandlerHostLinux() override;
-
-  // Starts the uploader thread. Must be called immediately after creating the
-  // class.
-  void StartUploaderThread();
-
-  // Get the file descriptor which processes should be given in order to signal
-  // crashes to the browser.
-  int GetDeathSignalSocket() const {
-    return process_socket_;
-  }
-
-  // MessagePumbLibevent::Watcher impl:
-  void OnFileCanWriteWithoutBlocking(int fd) override;
-  void OnFileCanReadWithoutBlocking(int fd) override;
-
-  // MessageLoop::DestructionObserver impl:
-  void WillDestroyCurrentMessageLoop() override;
-
-  // Whether we are shutting down or not.
-  bool IsShuttingDown() const;
-
- private:
-  void Init();
-
-  // Do work in a sequenced worker pool for OnFileCanReadWithoutBlocking().
-  void WriteDumpFile(scoped_ptr<BreakpadInfo> info,
-                     scoped_ptr<char[]> crash_context,
-                     pid_t crashing_pid,
-                     int signal_fd);
-
-  // Continue OnFileCanReadWithoutBlocking()'s work on the IO thread.
-  void QueueCrashDumpTask(scoped_ptr<BreakpadInfo> info, int signal_fd);
-
-  std::string process_type_;
-  base::FilePath dumps_path_;
-  bool upload_;
-
-  int process_socket_;
-  int browser_socket_;
-
-  base::MessageLoopForIO::FileDescriptorWatcher file_descriptor_watcher_;
-  scoped_ptr<base::Thread> uploader_thread_;
-  bool shutting_down_;
-
-  // Unique sequence token so that writing crash dump won't be blocked
-  // by other tasks.
-  base::SequencedWorkerPool::SequenceToken worker_pool_token_;
-
-  DISALLOW_COPY_AND_ASSIGN(CrashHandlerHostLinux);
-};
-
-}  // namespace breakpad
-
-#endif  // COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_HANDLER_HOST_LINUX_H_