Refactor CrashDump*Manager to use a shared CrashDumpObserver.

components/crash/content/browser/crash_dump_observer_android.cc

+// Copyright 2015 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.
+
+#include "components/crash/content/browser/crash_dump_observer_android.h"
+
+#include <unistd.h>
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/child_process_data.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/render_process_host.h"
+
+using content::BrowserThread;
+
+namespace breakpad {
+
+// static
+CrashDumpObserver* CrashDumpObserver::GetInstance() {
+  return base::Singleton<CrashDumpObserver>::get();
+}
+
+CrashDumpObserver::CrashDumpObserver() : weak_factory_(this) {
+  notification_registrar_.Add(this,
+                              content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
+                              content::NotificationService::AllSources());
+  notification_registrar_.Add(this,
+                              content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
+                              content::NotificationService::AllSources());
+}
+
+CrashDumpObserver::~CrashDumpObserver() {}
+
+void CrashDumpObserver::OnChildExit(int child_process_id,
+                                    base::ProcessHandle pid,
+                                    content::ProcessType process_type,
+                                    base::TerminationStatus termination_status,
+                                    base::android::ApplicationState app_state) {
+  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+
+  base::AutoLock auto_lock(registered_clients_lock_);
+  for (auto& client : registered_clients_) {
+    client->OnChildExit(child_process_id, pid, process_type, termination_status,
+                        app_state);
+  }
+}
+
+void CrashDumpObserver::RegisterClient(Client* client) {
+  base::AutoLock auto_lock(registered_clients_lock_);
+  if (std::find(std::begin(registered_clients_), std::end(registered_clients_),
+                client) != std::end(registered_clients_))

[Robert Sesek, 2016/08/04 16:59:01]

nit: needs braces since the condition is multi-line

[Tobias Sargeant, 2016/08/05 14:59:21]

Done.

+    return;
+  registered_clients_.push_back(client);
+}
+
+void CrashDumpObserver::UnregisterClient(Client* client) {
+  base::AutoLock auto_lock(registered_clients_lock_);
+  registered_clients_.remove(client);
+}
+
+void CrashDumpObserver::BrowserChildProcessStarted(
+    int child_process_id,
+    content::FileDescriptorInfo* mappings) {
+  base::AutoLock auto_lock(registered_clients_lock_);
+  for (auto& client : registered_clients_) {
+    client->OnChildStart(child_process_id, mappings);
+  }
+}
+
+void CrashDumpObserver::BrowserChildProcessHostDisconnected(
+    const content::ChildProcessData& data) {
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+      base::Bind(&CrashDumpObserver::OnChildExit, weak_factory_.GetWeakPtr(),
+                 data.id, data.handle,
+                 static_cast<content::ProcessType>(data.process_type),
+                 base::TERMINATION_STATUS_MAX_ENUM,
+                 base::android::APPLICATION_STATE_UNKNOWN));
+}
+
+void CrashDumpObserver::BrowserChildProcessCrashed(
+    const content::ChildProcessData& data,
+    int exit_code) {
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+      base::Bind(&CrashDumpObserver::OnChildExit, weak_factory_.GetWeakPtr(),
+                 data.id, data.handle,
+                 static_cast<content::ProcessType>(data.process_type),
+                 base::TERMINATION_STATUS_ABNORMAL_TERMINATION,
+                 base::android::APPLICATION_STATE_UNKNOWN));
+}
+
+void CrashDumpObserver::Observe(int type,
+                                const content::NotificationSource& source,
+                                const content::NotificationDetails& details) {
+  content::RenderProcessHost* rph =
+      content::Source<content::RenderProcessHost>(source).ptr();
+  base::TerminationStatus term_status = base::TERMINATION_STATUS_MAX_ENUM;
+  base::android::ApplicationState app_state =
+      base::android::APPLICATION_STATE_UNKNOWN;
+  switch (type) {
+    case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED: {
+      // NOTIFICATION_RENDERER_PROCESS_TERMINATED is sent when the renderer
+      // process is cleanly shutdown. However, we still need to close the
+      // minidump_fd we kept open.
+      term_status = base::TERMINATION_STATUS_NORMAL_TERMINATION;
+      break;
+    }
+    case content::NOTIFICATION_RENDERER_PROCESS_CLOSED: {
+      // We do not care about android fast shutdowns as it is a known case where
+      // the renderer is intentionally killed when we are done with it.
+      if (rph->FastShutdownStarted()) {
+        break;
+      }
+      content::RenderProcessHost::RendererClosedDetails* process_details =
+          content::Details<content::RenderProcessHost::RendererClosedDetails>(
+              details)
+              .ptr();
+      term_status = process_details->status;
+      app_state = base::android::ApplicationStatusListener::GetState();
+      break;
+    }
+    default:
+      NOTREACHED();
+      return;
+  }
+
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+      base::Bind(&CrashDumpObserver::OnChildExit, weak_factory_.GetWeakPtr(),

[Bernhard Bauer, 2016/08/04 16:01:32]

Actually, do you even need the weak pointer? This class is a singleton, so it
will be destroyed only after the message loops have stopped running anyway,
right? (Otherwise you'd need to make sure you destroy this on the FILE thread).

[Tobias Sargeant, 2016/08/05 14:59:22]

I think you're right. And being able to simplify that is a good argument for
keeping it a singleton, I think.

+                 rph->GetID(), rph->GetHandle(), content::PROCESS_TYPE_RENDERER,
+                 term_status, app_state));
+}
+
+}  // namespace breakpad