Speculative revert by sheriff

media/base/video_renderer_sink.h

-// 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.
-
-#ifndef MEDIA_BASE_VIDEO_RENDERER_SINK_H_
-#define MEDIA_BASE_VIDEO_RENDERER_SINK_H_
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/memory/ref_counted.h"
-#include "base/time/time.h"
-#include "media/base/media_export.h"
-#include "media/base/video_frame.h"
-
-namespace media {
-
-// VideoRendererSink is an interface representing the end-point for rendered
-// video frames.  An implementation is expected to periodically call Render() on
-// a callback object.
-class MEDIA_EXPORT VideoRendererSink {
- public:
-  class RenderCallback {
-   public:
-    // Returns a VideoFrame for rendering which should be displayed within the
-    // presentation interval [|deadline_min|, |deadline_max|].  Returns NULL if
-    // no frame or no new frame (since the last Render() call) is available for
-    // rendering within the requested interval.  Intervals are expected to be
-    // regular, contiguous, and monotonically increasing.  Irregular intervals
-    // may affect the rendering decisions made by the underlying callback.
-    virtual scoped_refptr<VideoFrame> Render(base::TimeTicks deadline_min,
-                                             base::TimeTicks deadline_max) = 0;
-
-    // Called by the sink when a VideoFrame previously returned via Render() was
-    // not actually rendered.  Must be called before the next Render() call.
-    virtual void OnFrameDropped() = 0;
-
-    virtual ~RenderCallback() {}
-  };
-
-  // Starts video rendering.  See RenderCallback for more details.  Must be
-  // called to receive Render() callbacks.  Callbacks may start immediately, so
-  // |callback| must be ready to receive callbacks before calling Start().
-  virtual void Start(RenderCallback* callback) = 0;
-
-  // Stops video rendering, waits for any outstanding calls to the |callback|
-  // given to Start() to complete before returning.  No new calls to |callback|
-  // will be issued after this method returns.  May be used as a means of power
-  // conservation by the sink implementation, so clients should call this
-  // liberally if no new frames are expected.
-  virtual void Stop() = 0;
-
-  // Instead of using a callback driven rendering path, allow clients to paint
-  // frames as they see fit without regard for the compositor.
-  // TODO(dalecurtis): This should be nuked once experiments show the new path
-  // is amazing and the old path is not! http://crbug.com/439548
-  virtual void PaintFrameUsingOldRenderingPath(
-      const scoped_refptr<VideoFrame>& frame) = 0;
-
-  virtual ~VideoRendererSink() {}
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_VIDEO_RENDERER_SINK_H_