Add experimental 'backlog' heuristic for measuring encoder utilization.

media/base/media_switches.cc

 // Copyright (c) 2012 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.
 
 #include "build/build_config.h"
 #include "media/base/media_switches.h"
 
 namespace switches {
 
 // Allow users to specify a custom buffer size for debugging purpose.
@@ skipping 105 matching lines @@
 
 // Disables the new rendering algorithm for webrtc, which is designed to improve
 // the rendering smoothness.
 const char kDisableRTCSmoothnessAlgorithm[] =
     "disable-rtc-smoothness-algorithm";
 
 // Enables demuxing of vp9 in mp4. Note that this flag will not have any effect
 // if MP4 demuxing is not enabled in the build.
 const char kEnableVp9InMp4[] = "enable-vp9-in-mp4";
 
+// Switches which method is used to compute the encoder utilization metric
+// (e.g., --cast-encoder-util-heuristic=backlog).
+//
+// TODO(miu): This is temporary, for lab performance testing, until a
+// good "works for all" solution is confirmed.
+// https://code.google.com/p/chrome-os-partner/issues/detail?id=54806
+const char kCastEncoderUtilHeuristic[] = "cast-encoder-util-heuristic";
+
 }  // namespace switches
 
 namespace media {
 
 // Use new audio rendering mixer.
 const base::Feature kNewAudioRenderingMixingStrategy{
     "NewAudioRenderingMixingStrategy", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Use shared block-based buffering for media.
 const base::Feature kUseNewMediaCache{"use-new-media-cache",
                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
 }  // namespace media