[TaskManager] Allow a Task to mutate its PID after creation

chrome/browser/task_manager/providers/task_provider.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 "chrome/browser/task_manager/providers/task_provider.h"
 
 namespace task_manager {
 
 TaskProvider::TaskProvider()
     : observer_(nullptr) {
@@ skipping 23 matching lines @@
 void TaskProvider::NotifyObserverTaskRemoved(Task* task) const {
   DCHECK(observer_);
   observer_->TaskRemoved(task);
 }
 
 void TaskProvider::NotifyObserverTaskUnresponsive(Task* task) const {
   DCHECK(observer_);
   observer_->TaskUnresponsive(task);
 }
 
+void TaskProvider::UpdateTaskProcessInfoAndNotifyObserver(
+    Task* existing_task,
+    base::ProcessHandle new_process_handle,
+    base::ProcessId new_process_id) const {
+  DCHECK(observer_);
+  existing_task->UpdateProcessInfo(new_process_handle, new_process_id,
+                                   observer_);
+}
+
 }  // namespace task_manager