Motown: Use new TimelineTransform and related definitions

services/media/factory_service/mojo_publisher.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.
-
-#ifndef SERVICES_MEDIA_FRAMEWORK_MOJO_PUBLISHER_H_
-#define SERVICES_MEDIA_FRAMEWORK_MOJO_PUBLISHER_H_
-
-#include <functional>
-#include <vector>
-
-namespace mojo {
-namespace media {
-
-// Implements pull mode publishing (e.g. MediaPlayer::GetStatus).
-template <typename TCallback>
-class MojoPublisher {
- public:
-  using CallbackRunner = std::function<void(const TCallback&, uint64_t)>;
-
-  // Sets the callback runner. This method must be called before calling Get
-  // or Updated. The callback runner calls a single callback using current
-  // information.
-  void SetCallbackRunner(const CallbackRunner& callback_runner) {
-    DCHECK(callback_runner);
-    callback_runner_ = callback_runner;
-  }
-
-  // Handles a get request from the client. This method should be called from
-  // the mojo 'get' method (e.g. MediaPlayer::GetStatus).
-  void Get(uint64_t version_last_seen, const TCallback& callback) {
-    DCHECK(callback_runner_);
-
-    if (version_last_seen < version_) {
-      callback_runner_(callback, version_);
-    } else {
-      pending_callbacks_.push_back(callback);
-    }
-  }
-
-  // Increments the version number and runs pending callbacks. This method
-  // should be called whenever the published information should be sent to
-  // subscribing clients.
-  void SendUpdates() {
-    DCHECK(callback_runner_);
-
-    ++version_;
-
-    std::vector<TCallback> pending_callbacks;
-    pending_callbacks_.swap(pending_callbacks);
-
-    for (const TCallback& pending_callback : pending_callbacks) {
-      callback_runner_(pending_callback, version_);
-    }
-  }
-
- private:
-  uint64_t version_ = 1u;
-  std::vector<TCallback> pending_callbacks_;
-  CallbackRunner callback_runner_;
-};
-
-}  // namespace media
-}  // namespace mojo
-
-#endif  // SERVICES_MEDIA_FRAMEWORK_MOJO_MOJO_ALLOCATOR_H_