Found on Android tip of tree build from today with DCHECKs enabled.
Device: Pixel 2
OS Version: Android P

But since this part of the code is not platform-specific, this issue can likely occur on other platforms as well.

Ran into this using the following steps:
* Navigate Chromium to https://jsfiddle.net/8o1veuhy/35/ to run a stress test script that keeps taking photos.
* After 1765 successful photos, the tab crashed
* Crash stack in logcat:
[FATAL:binding_state.cc(90)] Check failed: !is_bound(). Attempting to bind interface that is already bound: media.mojom.VideoCaptureObserver

Stack Trace:
  RELADDR   FUNCTION                                                                                                                                                                                   
  021ec0c5  logging::LogMessage::~LogMessage()                                                                                                                                                         
  0226ec41  mojo::internal::BindingStateBase::BindInternal(mojo::ScopedHandleBase<mojo::MessagePipeHandle>, scoped_refptr<base::SingleThreadTaskRunner>, char const*, std::__ndk1::unique_ptr<mojo::MessageReceiver, std::__ndk1::default_delete<mojo::MessageReceiver> >, bool, bool, mojo::MessageReceiverWithResponderStatus*, unsigned int)                                                    
  032ccf35  mojo::internal::BindingState<media::mojom::VideoCaptureObserver, mojo::RawPtrImplRefTraits<media::mojom::VideoCaptureObserver> >::Bind(mojo::ScopedHandleBase<mojo::MessagePipeHandle>, scoped_refptr<base::SingleThreadTaskRunner>)                                                                                                                                                         
  032ccdef  mojo::Binding<media::mojom::VideoCaptureObserver, mojo::RawPtrImplRefTraits<media::mojom::VideoCaptureObserver> >::Bind(mojo::InterfaceRequest<media::mojom::VideoCaptureObserver>, scoped_refptr<base::SingleThreadTaskRunner>)                                                                                                                                                         
  03e75789  content::VideoCaptureImpl::StartCaptureInternal()                                                                                                                                          
  03e755e3  content::VideoCaptureImpl::StartCapture(int, media::VideoCaptureParams const&, base::RepeatingCallback<void (content::VideoCaptureState)> const&, base::RepeatingCallback<void (scoped_refptr<media::VideoFrame> const&, base::TimeTicks)> const&)