Experiment with more aggressive MSE GC on memory pressure

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index 30431d742dcd5fcc4f3041eb1c91d3a1bcb1f7e0..936d5c0ec1d8370b15cc6d4007b45a6ec86e8ce7 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -169,6 +169,12 @@ const base::Feature kResumeBackgroundVideo {
 const base::Feature kBackgroundVideoTrackOptimization{
     "BackgroundVideoTrackOptimization", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Make MSE garbage collection algorithm more aggressive when we are under
+// moderate or critical memory pressure. This will relieve memory pressure by
+// releasing stale data from MSE buffers.
+const base::Feature kMemoryPressureBasedSourceBufferGC{
+    "MemoryPressureBasedSourceBufferGC", 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};