I'm seeing this in journalctl -b -g chromium:

spal. 19 15:00:35 blynas dbus-daemon[4473]: apparmor="DENIED" 
operation="dbus_bind"  bus="session" 
name="org.mpris.MediaPlayer2.chromium.instance5306" mask="bind" pid=5306 
label="snap.chromium.chromium"
spal. 19 15:00:35 blynas chromium_chromium.desktop[4596]: 
[5306:5650:1019/150035.747129:ERROR:bus.cc(555)] Failed to get the ownership of 
org.mpris.MediaPlayer2.chromium.instance5306: Connection ":1.116" is not 
allowed to own the service "org.mpris.MediaPlayer2.chromium.instance5306" due 
to AppArmor policy


There's also

spal. 19 14:45:47 blynas kernel: audit: type=1107 audit(1571485547.156:75): 
pid=1458 uid=103 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" 
operation="dbus_method_call"  bus="system" path="/" 
interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" 
mask="send" name="org.bluez" pid=5306 label="snap.chromium.chromium" 
peer_pid=1496 peer_label="unconfined"
                                  exe="/usr/bin/dbus-daemon" sauid=103 
hostname=? addr=? terminal=?'

but I think it the bluetooth headset button works via MPRIS, rather than
directly through bluez.

** Summary changed:

- cannot pause video with bluetooth headset buttons any more
+ [snap] cannot pause video with bluetooth headset buttons any more (MPRIS  
denied by apparmor)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1849105

Title:
  [snap] cannot pause video with bluetooth headset buttons any more
  (MPRIS  denied by apparmor)

Status in chromium-browser package in Ubuntu:
  New

Bug description:
  On Ubuntu 19.04 I could press the button on my Bluetooth headset and
  the YouTube video playing in my Chromium would pause/resume.  This no
  longer works in 19.10.  What happens instead is I get an OSD popup
  with a NO ENTRY symbol (circle with a diagonal backslash) from gnome-
  shell.

  I suspect the additional sandboxing of the snap package is the
  culprit.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: chromium-browser 76.0.3809.100-0ubuntu1~snap1
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  Uname: Linux 5.3.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  DRM.card0-DP-1:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-DP-2:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-1:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-2:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-eDP-1:
   enabled: enabled
   dpms: On
   status: connected
   edid-base64: 
AP///////wAGry1aAAAAAAAcAQSlHRF4Au6Vo1RMmSYPUFQAAAABAQEBAQEBAQEBAQEBAQEBtDeAoHA4PkA6KjUAJaUQAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTMzSEFOMDUuQSAKAHA=
   modes: 1920x1080
  Date: Mon Oct 21 15:04:13 2019
  DiskUsage:
   Filesystem     Type   Size  Used Avail Use% Mounted on
   /dev/nvme0n1p5 ext4   284G  208G   62G  78% /
   tmpfs          tmpfs  7,7G  122M  7,6G   2% /dev/shm
   /dev/nvme0n1p5 ext4   284G  208G   62G  78% /
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-06-12 (130 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: LENOVO 20Q0CTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-13-generic 
root=UUID=ad2946f7-6a38-471f-b7d1-779e8e9fd109 ro quiet splash vt.handoff=7
  Snap.ChromeDriverVersion: ChromeDriver 77.0.3865.120 
(416d6d8013e9adb6dd33b0c12e7614ff403d1a94-refs/branch-heads/3865@{#884})
  Snap.ChromiumVersion: Chromium 77.0.3865.120 snap
  SourcePackage: chromium-browser
  UpgradeStatus: Upgraded to eoan on 2019-10-18 (2 days ago)
  dmi.bios.date: 07/18/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2JET73W (1.51 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20Q0CTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN2JET73W(1.51):bd07/18/2019:svnLENOVO:pn20Q0CTO1WW:pvrThinkPadX390:rvnLENOVO:rn20Q0CTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X390
  dmi.product.name: 20Q0CTO1WW
  dmi.product.sku: LENOVO_MT_20Q0_BU_Think_FM_ThinkPad X390
  dmi.product.version: ThinkPad X390
  dmi.sys.vendor: LENOVO

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