Revert of [Cast] Compute utilization metrics and add performance overlay.

media/cast/sender/performance_metrics_overlay.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_CAST_SENDER_PERFORMANCE_METRICS_OVERLAY_H_
-#define MEDIA_CAST_SENDER_PERFORMANCE_METRICS_OVERLAY_H_
-
-// This module provides a display of frame-level performance metrics, rendered
-// in the lower-right corner of a VideoFrame.  It looks like this:
-//
-// +----------------------------------------------------------------+
-// |                         @@@@@@@@@@@@@@@@@@@@@@@                |
-// |                 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@                |
-// |              @@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@              |
-// |             @@@@@@@@@@@@@                    @@@@              |
-// |            @@@@@@@@@@                        @@@@              |
-// |           @@@@@  @@@               @@@       @@@@              |
-// |           @@@     @    @@@         @@@@      @@@@              |
-// |          @@@@          @@@@                  @@@@              |
-// |          @@@@                  @@@           @@@               |
-// |            @@@@                 @@           @@@               |
-// |             @@@@@      @@@            @@@   @@@                |
-// |              @@@@@     @@@@@        @@@@   @@@@                |
-// |               @@@@@      @@@@@@@@@@@@@    @@@@                 |
-// |                @@@@@@                    @@@@      1  45%  75% |
-// |                    @@@@@@@@         @@@@@@      22  16.7  4000 |
-// |                         @@@@@@@@@@@@@@@@      1280x720 0:15.12 |
-// +----------------------------------------------------------------+
-//
-// Line 1: Reads as, "1 frame ago, the encoder deadline utilization for the
-// frame was 45% and the lossy utilization was 75%."  Encoder deadline
-// utilization is in terms the amount of real-world time it took to encode the
-// frame, divided by the maximum amount of time allowed.  Lossy utilization is
-// the amount of "complexity" in the frame's content versus the target encoded
-// byte size, where a value over 100% means the frame's content is too complex
-// to encode within the target number of bytes.
-//
-// Line 2: Reads as, "Capture of this frame took 22 ms.  The expected duration
-// of this frame is 16.7 ms.  The target bitrate for this frame is 4000 kbps."
-//
-// Line 3: Contains the frame's resolution and media timestamp in
-// minutes:seconds.hundredths format.
-
-namespace media {
-
-class VideoFrame;
-
-namespace cast {
-
-// Renders an overlay of frame-level performance metrics in the lower-right
-// corner of the |frame|, as described above.  The verbose logging level for
-// video_frame_overlay.cc determines which lines, if any, are rendered: VLOG
-// level 1 renders the bottom line only, level 2 renders the bottom and middle
-// lines, and level 3 renders all three lines.  So, use the
-// --vmodule=performance_metrics_overlay=3 command line argument to turn on
-// rendering of the entire overlay.
-void MaybeRenderPerformanceMetricsOverlay(int target_bitrate,
-                                          int frames_ago,
-                                          double deadline_utilization,
-                                          double lossy_utilization,
-                                          VideoFrame* frame);
-
-}  // namespace cast
-}  // namespace media
-
-#endif  // MEDIA_CAST_SENDER_PERFORMANCE_METRICS_OVERLAY_H_