Disable background video track behind a feature flag

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 136 matching lines @@
 // when in background.
 const base::Feature kResumeBackgroundVideo {
   "resume-background-video",
 #if defined(OS_ANDROID)
       base::FEATURE_ENABLED_BY_DEFAULT
 #else
       base::FEATURE_DISABLED_BY_DEFAULT
 #endif
 };
 
+// Let video track be unselected when video is playing in the background.
+const base::Feature kBackgroundVideoTrackOptimization{
+    "BackgroundVideoTrackOptimization", 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};
 
 // Correct video colors based on output display?
 const base::Feature kVideoColorManagement{"video-color-management",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables support for External Clear Key (ECK) key system for testing on
 // supported platforms. On platforms that do not support ECK, this feature has
 // no effect.
 const base::Feature kExternalClearKeyForTesting{
     "external-clear-key-for-testing", base::FEATURE_DISABLED_BY_DEFAULT};
 
 #if defined(OS_ANDROID)
 // Replaces WPMA by the MediaPlayerRenderer for HLS and fallback playback.
 const base::Feature kAndroidMediaPlayerRenderer{
     "android-media-player-renderer", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 }  // namespace media