Migrate content/common/gpu/media code to media/gpu

content/common/gpu/media/video_accelerator_unittest_helpers.h

-// Copyright 2013 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.
-//
-// This file contains helper classes for video accelerator unittests.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_VIDEO_ACCELERATOR_UNITTEST_HELPERS_H_
-#define CONTENT_COMMON_GPU_MEDIA_VIDEO_ACCELERATOR_UNITTEST_HELPERS_H_
-
-#include <queue>
-
-#include "base/synchronization/condition_variable.h"
-#include "base/synchronization/lock.h"
-
-namespace content {
-
-// Helper class allowing one thread to wait on a notification from another.
-// If notifications come in faster than they are Wait()'d for, they are
-// accumulated (so exactly as many Wait() calls will unblock as Notify() calls
-// were made, regardless of order).
-template <typename StateEnum>
-class ClientStateNotification {
- public:
-  ClientStateNotification();
-  ~ClientStateNotification();
-
-  // Used to notify a single waiter of a ClientState.
-  void Notify(StateEnum state);
-  // Used by waiters to wait for the next ClientState Notification.
-  StateEnum Wait();
-
- private:
-  base::Lock lock_;
-  base::ConditionVariable cv_;
-  std::queue<StateEnum> pending_states_for_notification_;
-};
-
-template <typename StateEnum>
-ClientStateNotification<StateEnum>::ClientStateNotification() : cv_(&lock_) {}
-
-template <typename StateEnum>
-ClientStateNotification<StateEnum>::~ClientStateNotification() {}
-
-template <typename StateEnum>
-void ClientStateNotification<StateEnum>::Notify(StateEnum state) {
-  base::AutoLock auto_lock(lock_);
-  pending_states_for_notification_.push(state);
-  cv_.Signal();
-}
-
-template <typename StateEnum>
-StateEnum ClientStateNotification<StateEnum>::Wait() {
-  base::AutoLock auto_lock(lock_);
-  while (pending_states_for_notification_.empty())
-    cv_.Wait();
-  StateEnum ret = pending_states_for_notification_.front();
-  pending_states_for_notification_.pop();
-  return ret;
-}
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_VIDEO_ACCELERATOR_UNITTEST_HELPERS_H_