Experiment with more aggressive MSE GC on memory pressure

media/filters/chunk_demuxer.h

Index: media/filters/chunk_demuxer.h
diff --git a/media/filters/chunk_demuxer.h b/media/filters/chunk_demuxer.h
index 020aa1417e4198da25871326c37fee2511d2c9a7..32eaded69fb2e42e255b8ba866af7b4c3c5e04bd 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -16,6 +16,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/memory_pressure_listener.h"
 #include "base/synchronization/lock.h"
 #include "media/base/byte_queue.h"
 #include "media/base/demuxer.h"
@@ -66,6 +67,11 @@ class MEDIA_EXPORT ChunkDemuxerStream : public DemuxerStream {
   // https://w3c.github.io/media-source/#sourcebuffer-coded-frame-eviction
   bool EvictCodedFrames(DecodeTimestamp media_time, size_t newDataSize);
 
+  void OnMemoryPressure(
+      DecodeTimestamp media_time,
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level,
+      bool force_instant_gc);
+
   // Signal to the stream that duration has changed to |duration|.
   void OnSetDuration(base::TimeDelta duration);
 
@@ -270,6 +276,11 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
                         base::TimeDelta currentMediaTime,
                         size_t newDataSize);
 
+  void OnMemoryPressure(
+      base::TimeDelta currentMediaTime,
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level,
+      bool force_instant_gc);
+
   // Returns the current presentation duration.
   double GetDuration();
   double GetDuration_Locked();