[Chromecast] Upgrade to new CMA backend API

chromecast/public/media/media_clock_device.h

-// Copyright 2014 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 CHROMECAST_PUBLIC_MEDIA_MEDIA_CLOCK_DEVICE_H_
-#define CHROMECAST_PUBLIC_MEDIA_MEDIA_CLOCK_DEVICE_H_
-
-#include <string>
-
-namespace chromecast {
-namespace media {
-
-// Interface for platform-specific pipeline clock.
-// Pipeline clocks follow this state machine:
-//                      -------------------
-//                      |                 |
-//                      v                 |
-// kUninitialized --> kIdle  --------- kRunning
-//
-// {any state} --> kError
-//
-// Notes:
-// - Hardware resources should be acquired when transitioning from the
-//   |kUninitialized| state to the |kIdle| state.
-// - The initial value of the timeline will only be set in the kIdle state.
-class MediaClockDevice {
- public:
-  enum State {
-    kStateUninitialized,
-    kStateIdle,
-    kStateRunning,
-    kStateError,
-  };
-
-  virtual ~MediaClockDevice() {}
-
-  // Returns the current state of the media clock.
-  virtual State GetState() const = 0;
-
-  // Changes the state and performs any necessary transitions.
-  // Returns true when successful.
-  virtual bool SetState(State new_state) = 0;
-
-  // Sets the initial value of the timeline in microseconds.
-  // Will only be invoked in state kStateIdle.
-  // Returns true when successful.
-  virtual bool ResetTimeline(int64_t time_microseconds) = 0;
-
-  // Sets the clock rate.
-  // |rate| == 0 means the clock is not progressing and that the renderer
-  // tied to this media clock should pause rendering.
-  // Will only be invoked in states kStateIdle or kStateRunning.
-  virtual bool SetRate(float rate) = 0;
-
-  // Retrieves the media clock time in microseconds.
-  // Will only be invoked in states kStateIdle or kStateRunning.
-  virtual int64_t GetTimeMicroseconds() = 0;
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_H_