This test fails on five trybots:

  DownloadsToolbarTest.All

Bot links:

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

Affected test steps are:

  browser_tests
  mus_browser_tests
  network_service_browser_tests
  site_per_process_browser_tests

Output includes:

[1:1:0109/123713.274196:FATAL:PaintLayer.h(338)] Check failed: !needs_descendant_dependent_flags_update_.
#0 0x0000053e8bac base::debug::StackTrace::StackTrace()
#1 0x00000540913c logging::LogMessage::~LogMessage()
#2 0x000008edda75 blink::PaintLayer::SubtreeIsInvisible()
#3 0x00000909f746 blink::LocalFrameView::InvalidateViewportConstrainedObjects()
#4 0x0000097a942a blink::PaintLayerScrollableArea::InvalidatePaintForScrollOffsetChange()
#5 0x0000097a86b9 blink::PaintLayerScrollableArea::UpdateScrollOffset()
#6 0x000008a397be blink::ScrollableArea::ScrollOffsetChanged()
#7 0x000008a3d0c0 blink::ProgrammaticScrollAnimator::ScrollToOffsetWithoutAnimation()
#8 0x000008a396ab blink::ScrollableArea::SetScrollOffset()
#9 0x0000090dc484 blink::RootFrameViewport::DistributeScrollBetweenViewports()
#10 0x000008a397be blink::ScrollableArea::ScrollOffsetChanged()
#11 0x000008a3d0c0 blink::ProgrammaticScrollAnimator::ScrollToOffsetWithoutAnimation()
#12 0x000008a396ab blink::ScrollableArea::SetScrollOffset()
#13 0x0000090dc0f4 blink::RootFrameViewport::SetScrollOffset()
#14 0x00000952f83e blink::LayoutObject::ScrollRectToVisible()
#15 0x000008e015ea blink::Element::UpdateFocusAppearanceWithOptions()
#16 0x000008dbdd33 blink::Document::SetFocusedElement()
#17 0x000009709071 blink::FocusController::SetFocusedElement()
#18 0x000008e01049 blink::Element::focus()
#19 0x0000091791a6 blink::SetFocusForDialog()
#20 0x0000091793f1 blink::HTMLDialogElement::showModal()
#21 0x0000088a151d blink::V8HTMLDialogElement::showModalMethodCallback()
#22 0x000004724d82 v8::internal::FunctionCallbackArguments::Call()
#23 0x00000480a8d5 v8::internal::(anonymous namespace)::HandleApiCallHelper<>()
#24 0x0000048089c9 v8::internal::Builtin_Impl_HandleApiCall()
#25 0x00000480840d v8::internal::Builtin_HandleApiCall()
#26 0x04b820484384 <unknown>