Move more files from chrome/test to chrome/test/base, part #2

chrome/test/thread_observer_helper.h

-// Copyright (c) 2011 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.
-
-#ifndef CHROME_TEST_THREAD_OBSERVER_HELPER_H__
-#define CHROME_TEST_THREAD_OBSERVER_HELPER_H__
-#pragma once
-
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/waitable_event.h"
-#include "content/browser/browser_thread.h"
-#include "content/common/notification_observer_mock.h"
-#include "content/common/notification_registrar.h"
-
-// Helper class to add and remove observers on a non-UI thread from
-// the UI thread.
-template <class T, typename Traits>
-class ThreadObserverHelper : public base::RefCountedThreadSafe<T, Traits> {
- public:
-  explicit ThreadObserverHelper(BrowserThread::ID id)
-      : id_(id), done_event_(false, false) {}
-
-  void Init() {
-    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-    BrowserThread::PostTask(
-        id_,
-        FROM_HERE,
-        NewRunnableMethod(this, &ThreadObserverHelper::RegisterObserversTask));
-    done_event_.Wait();
-  }
-
-  virtual ~ThreadObserverHelper() {
-    DCHECK(BrowserThread::CurrentlyOn(id_));
-    registrar_.RemoveAll();
-  }
-
-  NotificationObserverMock* observer() {
-    return &observer_;
-  }
-
- protected:
-  friend class base::RefCountedThreadSafe<T>;
-
-  virtual void RegisterObservers() = 0;
-
-  NotificationRegistrar registrar_;
-  NotificationObserverMock observer_;
-
- private:
-  void RegisterObserversTask() {
-    DCHECK(BrowserThread::CurrentlyOn(id_));
-    RegisterObservers();
-    done_event_.Signal();
-  }
-
-  BrowserThread::ID id_;
-  base::WaitableEvent done_event_;
-};
-
-class DBThreadObserverHelper;
-typedef ThreadObserverHelper<
-    DBThreadObserverHelper,
-    BrowserThread::DeleteOnDBThread> DBThreadObserverHelperBase;
-
-class DBThreadObserverHelper : public DBThreadObserverHelperBase {
- public:
-  DBThreadObserverHelper() : DBThreadObserverHelperBase(BrowserThread::DB) {}
-};
-
-#endif  // CHROME_TEST_THREAD_OBSERVER_HELPER_H__