Make MSE buffer sizes configurable via command line

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 c5fe017b32e15e318a065d8dd15a5ce4d400fcad..2e061cd022489aa94d0bffcd8860d3507a99f0da 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -126,6 +126,11 @@ const char kEnableVp9InMp4[] = "enable-vp9-in-mp4";
 // Force media player using SurfaceView instead of SurfaceTexture on Android.
 const char kForceVideoOverlays[] = "force-video-overlays";
 
+// Allows explicitly specifying MSE audio/video buffer sizes.
+// Default values are 150M for video and 12M for audio.
+const char kMSEAudioBufferSize[] = "mse-audio-buffer-size";
+const char kMSEVideoBufferSize[] = "mse-video-buffer-size";
+
 }  // namespace switches
 
 namespace media {