Chrome Version: 71.0.3576.0 (Developer Build) (64-bit)
OS: Linux

What steps will reproduce the problem?
(1) Go to https://beaufortfrancois.github.io/sandbox/media/picture-in-picture-playground with SurfaceLayerMode = kAlways, or kOnDemand
(2) Toggle PiP on given video (should be non-MediaStream)
(3) Toggle MediaStream

What is the expected result?
We switch over to the MediaStream video

What happens instead?
Crash

[58234:58234:1009/155329.969994:FATAL:picture_in_picture_window_controller_impl.cc(160)] Check failed: media_player_id_.has_value(). 
#0 0x7f3d140cad6d base::debug::StackTrace::StackTrace()
#1 0x7f3d13dd913a base::debug::StackTrace::StackTrace()
#2 0x7f3d13e436ce logging::LogMessage::~LogMessage()
#3 0x7f3d0cf6f8b1 content::PictureInPictureWindowControllerImpl::UpdatePlaybackState()
#4 0x7f3d0ce7aa5a content::MediaWebContentsObserver::OnMediaPaused()
#5 0x7f3d0ce7ee5c _ZN3IPC20DispatchToMethodImplIN7content24MediaWebContentsObserverEMS2_FvPNS1_15RenderFrameHostEibES3_NSt3__15tupleIJibEEEJLm0ELm1EEEEvPT_T0_PT1_OT2_NS7_16integer_sequenceImJXspT3_EEEE
#6 0x7f3d0ce7ed60 _ZN3IPC16DispatchToMethodIN7content24MediaWebContentsObserverENS1_15RenderFrameHostEJibENSt3__15tupleIJibEEEEENS4_9enable_ifIXeqsZT1_sr3std10tuple_sizeINS4_5decayIT2_E4typeEEE5valueEvE4typeEPT_MSE_FvPT0_DpT1_ESH_OS9_
#7 0x7f3d0ce7cd00 _ZN3IPC8MessageTI45MediaPlayerDelegateHostMsg_OnMediaPaused_MetaNSt3__15tupleIJibEEEvE8DispatchIN7content24MediaWebContentsObserverES8_NS7_15RenderFrameHostEMS8_FvPS9_ibEEEbPKNS_7MessageEPT_PT0_PT1_T2_
#8 0x7f3d0ce7a635 content::MediaWebContentsObserver::OnMessageReceived()
#9 0x7f3d0d53272c content::WebContentsImpl::OnMessageReceived()
#10 0x7f3d0cacb7fc content::RenderFrameHostImpl::OnMessageReceived()
#11 0x7f3d0d1439a3 content::RenderProcessHostImpl::OnMessageReceived()
#12 0x7f3d107fcd25 IPC::ChannelProxy::Context::OnDispatchMessage()
#13 0x7f3d10802acf _ZN4base8internal13FunctorTraitsIMN3IPC12ChannelProxy7ContextEFvRKNS2_7MessageEEvE6InvokeIS9_RK13scoped_refptrIS4_EJS7_EEEvT_OT0_DpOT1_
#14 0x7f3d10802a2f _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMN3IPC12ChannelProxy7ContextEFvRKNS4_7MessageEEJRK13scoped_refptrIS6_ES9_EEEvOT_DpOT0_
#15 0x7f3d108029bd _ZN4base8internal7InvokerINS0_9BindStateIMN3IPC12ChannelProxy7ContextEFvRKNS3_7MessageEEJ13scoped_refptrIS5_ES6_EEEFvvEE7RunImplIRKSA_RKNSt3__15tupleIJSC_S6_EEEJLm0ELm1EEEEvOT_OT0_NSJ_16integer_sequenceImJXspT1_EEEE
#16 0x7f3d108028bc _ZN4base8internal7InvokerINS0_9BindStateIMN3IPC12ChannelProxy7ContextEFvRKNS3_7MessageEEJ13scoped_refptrIS5_ES6_EEEFvvEE3RunEPNS0_13BindStateBaseE
#17 0x7f3d13d8a21e _ZNO4base12OnceCallbackIFvvEE3RunEv
#18 0x7f3d13dda66a base::debug::TaskAnnotator::RunTask()
#19 0x7f3d13e69918 base::MessageLoop::RunTask()
#20 0x7f3d13e69c1b base::MessageLoop::DeferOrRunPendingTask()
#21 0x7f3d13e6a064 base::MessageLoop::DoWork()
#22 0x7f3d1411a5c9 base::MessagePumpLibevent::Run()
#23 0x7f3d13e690ee base::MessageLoop::Run()
#24 0x7f3d13f11bd2 base::RunLoop::Run()
#25 0x55916015f4be ChromeBrowserMainParts::MainMessageLoopRun()
#26 0x7f3d0c55046a content::BrowserMainLoop::RunMainMessageLoopParts()
#27 0x7f3d0c558cc0 content::BrowserMainRunnerImpl::Run()
#28 0x7f3d0c54356e content::BrowserMain()
#29 0x7f3d0e772a90 content::RunBrowserProcessMain()
#30 0x7f3d0e77575a content::ContentMainRunnerImpl::Run()
#31 0x7f3d0e76a38c content::ContentServiceManagerMainDelegate::RunEmbedderProcess()
#32 0x7f3d143f07d1 service_manager::Main()
#33 0x7f3d0e770505 content::ContentMain()
#34 0x55915caa5c26 ChromeMain
#35 0x55915caa5b32 main
#36 0x7f3ce57b62b1 __libc_start_main
#37 0x55915caa5a0a _start