content: convert child process notifications to observer usage

chrome/browser/android/crash_dump_manager.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 CHROME_BROWSER_ANDROID_CRASH_DUMP_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_CRASH_DUMP_MANAGER_H_
 
 #include <map>
 
 #include "base/files/file_path.h"
 #include "base/platform_file.h"
 #include "base/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;
 }
 
 // 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::NotificationObserver {
+class CrashDumpManager : public content::BrowserChildProcessObserver,
+                         public content::NotificationObserver {
  public:
   // This object is a singleton created and owned by the
   // ChromeBrowserMainPartsAndroid.
   static CrashDumpManager* GetInstance();
 
   virtual ~CrashDumpManager();
 
   // Returns a file descriptor that should be used to generate a minidump for
   // the process |child_process_id|.
   int CreateMinidumpFile(int child_process_id);
 
  private:
   friend class ChromeBrowserMainPartsAndroid;
 
   // Should be created on the UI thread.
   CrashDumpManager();
 
   typedef std::map<int, base::FilePath> ChildProcessIDToMinidumpPath;
 
   static void ProcessMinidump(const base::FilePath& minidump_path,
                               base::ProcessHandle pid);
 
+  // content::BrowserChildProcessObserver implementation:
+  virtual void BrowserChildProcessHostDisconnected(
+      const content::ChildProcessData& data) OVERRIDE;
+  virtual void BrowserChildProcessCrashed(
+      const content::ChildProcessData& data) OVERRIDE;
+
   // NotificationObserver implementation:
   virtual 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_;
 
   static CrashDumpManager* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(CrashDumpManager);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_CRASH_DUMP_MANAGER_H_