Starting around April 7th, we've started getting flaky renderer crashes in WebXR tests with Daydream View paired. This appears to be on presentation exit, but I'm not 100% sure. Symbolized stack trace is:

FATAL:xr_frame_provider.cc(326)] Check failed: presentation_provider_. 
Stack Trace:
  RELADDR   FUNCTION                                                                                                                                    FILE:LINE
  00e53175  logging::LogMessage::~LogMessage()                                                                                                          ../../base/logging.cc:594:29
  040274bb  blink::XRFrameProvider::SubmitWebGLLayer(blink::XRWebGLLayer*, bool)                                                                        ../../third_party/blink/renderer/modules/xr/xr_frame_provider.cc:326:3
  04029345  blink::XRSession::OnFrame(std::__ndk1::unique_ptr<blink::TransformationMatrix, std::__ndk1::default_delete<blink::TransformationMatrix> >)  ../../third_party/blink/renderer/modules/xr/xr_session.cc:341:25
  04027101  blink::XRFrameProvider::ProcessScheduledFrame(double)                                                                                       ../../third_party/blink/renderer/modules/xr/xr_frame_provider.cc:299:25
  00e3a4c1  base::OnceCallback<void ()>::Run() &&                                                                                                       ../../base/callback.h:95:12
  v------>  WTF::ThreadCheckingCallbackWrapper<base::OnceCallback<void ()>, void ()>::RunInternal(base::OnceCallback<void ()>*)                         ../../third_party/blink/renderer/platform/wtf/functional.h:258:33
  0281d01b  WTF::ThreadCheckingCallbackWrapper<base::OnceCallback<void ()>, void ()>::Run()                                                             ../../third_party/blink/renderer/platform/wtf/functional.h:245:0
  00e3a4c1  base::OnceCallback<void ()>::Run() &&                                                                                                       ../../base/callback.h:95:12
  00e42c9f  base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)                                                                        ../../base/debug/task_annotator.cc:101:33
  02a02fdf  blink::scheduler::internal::ThreadControllerImpl::DoWork(blink::scheduler::internal::SequencedTaskSource::WorkType)                         ../../third_party/blink/renderer/platform/scheduler/base/thread_controller_impl.cc:162:21
  00e3a4c1  base::OnceCallback<void ()>::Run() &&                                                                                                       ../../base/callback.h:95:12
  00e42c9f  base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)                                                                        ../../base/debug/task_annotator.cc:101:33
  00e57599  base::internal::IncomingTaskQueue::RunTask(base::PendingTask*)                                                                              ../../base/message_loop/incoming_task_queue.cc:124:19
  00e59049  base::MessageLoop::RunTask(base::PendingTask*)                                                                                              ../../base/message_loop/message_loop.cc:354:25
  00e5924f  base::MessageLoop::DeferOrRunPendingTask(base::PendingTask)                                                                                 ../../base/message_loop/message_loop.cc:364:5
  00e5931d  base::MessageLoop::DoWork()                                                                                                                 ../../base/message_loop/message_loop.cc:408:16
  00e5a0df  base::MessagePumpDefault::Run(base::MessagePump::Delegate*)                                                                                 ../../base/message_loop/message_pump_default.cc:37:31
  00e58e0f  base::MessageLoop::Run(bool)                                                                                                                ../../base/message_loop/message_loop.cc:306:12
  00e6f687  base::RunLoop::Run()                                                                                                                        ../../base/run_loop.cc:130:14
  040dc747  content::RendererMain(content::MainFunctionParams const&)                                                                                   ../../content/renderer/renderer_main.cc:248:23
  02acd3b9  content::ContentMainRunnerImpl::Run()                                                                                                       ../../content/app/content_main_runner.cc:706:12
  01b37f19  service_manager::Main(service_manager::MainParams const&)                                                                                   ../../services/service_manager/embedder/main.cc:453:29
  v------>  content::JNI_ContentMain_Start(_JNIEnv*, base::android::JavaParamRef<_jclass*> const&)                                                      ../../content/app/android/content_main.cc:42:10
  02accc5d  Java_org_chromium_content_app_ContentMain_nativeStart                                                                                       gen/content/public/android/content_jni_headers/content/jni/ContentMain_jni.h:45:0