Revert of Delete deprecated and transitional stuff related to video frame refactoring.

webrtc/media/base/videoframe.h

+/*
+ *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// TODO(nisse): Deprecated, replace cricket::VideoFrame with
+// webrtc::VideoFrame everywhere, then delete this file. See
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=5682.
+
+#ifndef WEBRTC_MEDIA_BASE_VIDEOFRAME_H_
+#define WEBRTC_MEDIA_BASE_VIDEOFRAME_H_
+
+// TODO(nisse): Some applications expect that including this file
+// implies an include of logging.h. So keep for compatibility, until
+// this file can be deleted.
+#include "webrtc/base/logging.h"
+
+#include "webrtc/api/video/video_frame.h"
+
+// TODO(nisse): Similarly, some applications expect that including this file
+// implies a forward declaration of rtc::Thread.
+namespace rtc {
+class Thread;
+}  // namespace rtc
+
+namespace cricket {
+
+using VideoFrame = webrtc::VideoFrame;
+
+}  // namespace cricket
+
+#endif  // WEBRTC_MEDIA_BASE_VIDEOFRAME_H_