Remove Hung plugin detector

chrome/common/worker_thread_ticker.cc

-// 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.
-
-#include "chrome/common/worker_thread_ticker.h"
-
-#include <algorithm>
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread.h"
-
-WorkerThreadTicker::WorkerThreadTicker(int tick_interval)
-    : timer_thread_("worker_thread_ticker"),
-      is_running_(false),
-      tick_interval_(base::TimeDelta::FromMilliseconds(tick_interval)) {
-}
-
-WorkerThreadTicker::~WorkerThreadTicker() {
-  Stop();
-}
-
-bool WorkerThreadTicker::RegisterTickHandler(Callback *tick_handler) {
-  DCHECK(tick_handler);
-  base::AutoLock lock(lock_);
-  // You cannot change the list of handlers when the timer is running.
-  // You need to call Stop first.
-  if (IsRunning())
-    return false;
-  tick_handler_list_.push_back(tick_handler);
-  return true;
-}
-
-bool WorkerThreadTicker::UnregisterTickHandler(Callback *tick_handler) {
-  DCHECK(tick_handler);
-  base::AutoLock lock(lock_);
-  // You cannot change the list of handlers when the timer is running.
-  // You need to call Stop first.
-  if (IsRunning()) {
-    return false;
-  }
-  TickHandlerListType::iterator index = std::remove(tick_handler_list_.begin(),
-                                                    tick_handler_list_.end(),
-                                                    tick_handler);
-  if (index == tick_handler_list_.end()) {
-    return false;
-  }
-  tick_handler_list_.erase(index, tick_handler_list_.end());
-  return true;
-}
-
-bool WorkerThreadTicker::Start() {
-  // Do this in a lock because we don't want 2 threads to
-  // call Start at the same time
-  base::AutoLock lock(lock_);
-  if (IsRunning())
-    return false;
-  if (!timer_thread_.Start())
-    return false;
-  is_running_ = true;
-  ScheduleTimerTask();
-  return true;
-}
-
-bool WorkerThreadTicker::Stop() {
-  // Do this in a lock because we don't want 2 threads to
-  // call Stop at the same time
-  base::AutoLock lock(lock_);
-  if (!IsRunning())
-    return false;
-  is_running_ = false;
-  timer_thread_.Stop();
-  return true;
-}
-
-void WorkerThreadTicker::ScheduleTimerTask() {
-  timer_thread_.task_runner()->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&WorkerThreadTicker::TimerTask, base::Unretained(this)),
-      tick_interval_);
-}
-
-void WorkerThreadTicker::TimerTask() {
-  // When the ticker is running, the handler list CANNOT be modified.
-  // So we can do the enumeration safely without a lock
-  const TickHandlerListType& handlers = tick_handler_list_;
-  for (TickHandlerListType::const_iterator i = handlers.begin();
-       i != handlers.end(); ++i) {
-    (*i)->OnTick();
-  }
-
-  ScheduleTimerTask();
-}
-