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

chrome/browser/task_manager/task_manager_browsertest_util.h

 // Copyright 2016 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.
 
 // These "task_manager::browsertest_util" functions allow you to wait for a
 // task manager to show a particular state, enabling tests of the form "do
 // something that ought to create a process, then wait for that process to show
 // up in the Task Manager." They are intended to abstract away the details of
 // the platform's TaskManager UI.
 
 #ifndef CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_
 #define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_
 
 #include <stddef.h>
 
 #include "base/strings/string16.h"
 
 namespace task_manager {
 namespace browsertest_util {
 
 // Specifies some integer-valued column of numeric data reported by the task
 // manager model. Please add more here as needed by tests.
 enum class ColumnSpecifier {
+  PROCESS_ID,
+  PHYSICAL_MEMORY,
   V8_MEMORY,
   V8_MEMORY_USED,
   SQLITE_MEMORY_USED,
   IDLE_WAKEUPS,
   MEMORY_STATE,
 
   COLUMN_NONE,  // Default value.
 };
 
 // Runs the message loop, observing the task manager, until there are exactly
@@ skipping 38 matching lines @@
 base::string16 MatchSubframe(const char* title);    // "Subframe: " + title
 base::string16 MatchAnySubframe();                  // "Subframe: *"
 // "Utility: " + title
 base::string16 MatchUtility(const base::string16& title);
 base::string16 MatchAnyUtility();                   // "Utility: *"
 
 }  // namespace browsertest_util
 }  // namespace task_manager
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_