[Part 1 of 6] Move MockWebContentsTaskManager into its own file.

chrome/browser/task_management/task_management_browsertest_util.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_management/task_management_browsertest_util.h"
-
-#include "base/stl_util.h"
-#include "build/build_config.h"
-
-#if defined(OS_CHROMEOS)
-#include "chrome/browser/chromeos/resource_reporter/resource_reporter.h"
-#endif  // defined(OS_CHROMEOS)
-
-namespace task_management {
-
-MockWebContentsTaskManager::MockWebContentsTaskManager() {
-}
-
-MockWebContentsTaskManager::~MockWebContentsTaskManager() {
-}
-
-void MockWebContentsTaskManager::TaskAdded(Task* task) {
-  DCHECK(task);
-  DCHECK(!ContainsValue(tasks_, task));
-  tasks_.push_back(task);
-}
-
-void MockWebContentsTaskManager::TaskRemoved(Task* task) {
-  DCHECK(task);
-  DCHECK(ContainsValue(tasks_, task));
-  tasks_.erase(std::find(tasks_.begin(), tasks_.end(), task));
-}
-
-void MockWebContentsTaskManager::StartObserving() {
-#if defined(OS_CHROMEOS)
-  // On ChromeOS, the ResourceReporter needs to be turned off so as not to
-  // interfere with the tests.
-  chromeos::ResourceReporter::GetInstance()->StopMonitoring();
-#endif  // defined(OS_CHROMEOS)
-
-  provider_.SetObserver(this);
-}
-
-void MockWebContentsTaskManager::StopObserving() {
-  provider_.ClearObserver();
-}
-
-}  // namespace task_management