Revert of Turn components/crash into a layered component.

components/crash/browser/crash_dump_manager_android.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_BROWSER_CRASH_DUMP_MANAGER_ANDROID_H_
+#define COMPONENTS_CRASH_BROWSER_CRASH_DUMP_MANAGER_ANDROID_H_
+
+#include <map>
+
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "base/process/process.h"
+#include "base/synchronization/lock.h"
+#include "content/public/browser/browser_child_process_observer.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace content {
+class RenderProcessHost;
+}
+
+namespace breakpad {
+
+// This class manages the crash minidumps.
+// On Android, because of process isolation, each renderer process runs with a
+// different UID. As a result, we cannot generate the minidumps in the browser
+// (as the browser process does not have access to some system files for the
+// crashed process). So the minidump is generated in the renderer process.
+// Since the isolated process cannot open files, we provide it on creation with
+// a file descriptor where to write the minidump in the event of a crash.
+// This class creates these file descriptors and associates them with render
+// processes and take the appropriate action when the render process terminates.
+class CrashDumpManager : public content::BrowserChildProcessObserver,
+                         public content::NotificationObserver {
+ public:
+  // The embedder should create a single instance of the CrashDumpManager.
+  static CrashDumpManager* GetInstance();
+
+  // Should be created on the UI thread.
+  explicit CrashDumpManager(const base::FilePath& crash_dump_dir);
+
+  ~CrashDumpManager() override;
+
+  // Returns a file that should be used to generate a minidump for the process
+  // |child_process_id|.
+  base::File CreateMinidumpFile(int child_process_id);
+
+ private:
+  typedef std::map<int, base::FilePath> ChildProcessIDToMinidumpPath;
+
+  static void ProcessMinidump(const base::FilePath& minidump_path,
+                              base::ProcessHandle pid);
+
+  // content::BrowserChildProcessObserver implementation:
+  void BrowserChildProcessHostDisconnected(
+      const content::ChildProcessData& data) override;
+  void BrowserChildProcessCrashed(
+      const content::ChildProcessData& data,
+      int exit_code) override;
+
+  // NotificationObserver implementation:
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  // Called on child process exit (including crash).
+  void OnChildExit(int child_process_id, base::ProcessHandle pid);
+
+  content::NotificationRegistrar notification_registrar_;
+
+  // This map should only be accessed with its lock aquired as it is accessed
+  // from the PROCESS_LAUNCHER and UI threads.
+  base::Lock child_process_id_to_minidump_path_lock_;
+  ChildProcessIDToMinidumpPath child_process_id_to_minidump_path_;
+
+  base::FilePath crash_dump_dir_;
+
+  static CrashDumpManager* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrashDumpManager);
+};
+
+}  // namespace breakpad
+
+#endif  // COMPONENTS_CRASH_BROWSER_CRASH_DUMP_MANAGER_ANDROID_H_