These two tests fail in the interactive_ui_tests step on some trybots:

  SitePerProcessInteractiveBrowserTest.FullscreenElementInABAAndExitViaJS
  SitePerProcessInteractiveBrowserTest.FullscreenElementInABAAndExitViaEscapeKey

Four bots fail both tests:

  https://ci.chromium.org/buildbot/tryserver.chromium.linux/linux_chromium_rel_ng/620275
  https://ci.chromium.org/buildbot/tryserver.chromium.linux/linux_chromium_asan_rel_ng/521864
  https://ci.chromium.org/buildbot/tryserver.chromium.chromiumos/linux-chromeos-rel/34722
  https://ci.chromium.org/buildbot/tryserver.chromium.win/win7_chromium_rel_ng/76819

Two bots fail only FullscreenElementInABAAndExitViaJS:

  https://ci.chromium.org/buildbot/tryserver.chromium.mac/mac_chromium_rel_ng/623932
  https://ci.chromium.org/buildbot/tryserver.chromium.win/win10_chromium_x64_rel_ng/58124

On linux_chromium_rel_ng, FullscreenElementInABAAndExitViaEscapeKey also fails in the site_per_process_interactive_ui_tests step.

For both tests, the output contains:

[1:1:0109/123431.673193:FATAL:PaintLayer.cpp(2585)] Check failed: IsAllowedToQueryCompositingState().
#0 0x000004e70f0c base::debug::StackTrace::StackTrace()
#1 0x000004e91aac logging::LogMessage::~LogMessage()
#2 0x0000083b5376 blink::PaintLayer::GetCompositedLayerMapping()
#3 0x0000083d40d3 blink::PaintLayerScrollableArea::LayerForScrolling()
#4 0x000007668a92 blink::ScrollableArea::LayerForContainer()
#5 0x000007c22a37 blink::WebViewImpl::RegisterViewportLayersWithCompositor()
#6 0x00000836f8a4 blink::TopDocumentRootScrollerController::DidUpdateCompositing()
#7 0x000007cd294d blink::LocalFrameView::UpdateLifecyclePhasesInternal()
#8 0x000007cd25d7 blink::LocalFrameView::UpdateAllLifecyclePhases()
#9 0x000008346c2e blink::PageAnimator::UpdateAllLifecyclePhases()
#10 0x000008ed4363 blink::WebFrameWidgetImpl::UpdateAllLifecyclePhases()
#11 0x000008ecd4c1 content::RenderWidget::UpdateVisualState()
#12 0x000005a1bf8d cc::ProxyMain::BeginMainFrame()