This causes a failure in scrollbars/scrollbar-added-during-drag.html

crash log for renderer (pid <unknown>):
STDOUT: <empty>
STDERR: [1:1:0509/132040.085034:ERROR:paint_controller_debug_data.cc(155)] current display item list: []
STDERR: 
STDERR: [1:1:0509/132040.085279:ERROR:paint_controller_debug_data.cc(164)] new display item list: [
STDERR:   {
STDERR:     "chunk": "LayoutView #document 0x85e56f49218:ForeignLayerWrapper:0",
STDERR:     "state": "t:0x85e56fa9cf0 c:0x85e56f9c250 e:0x85e56f541f0",
STDERR:     "displayItems": [
STDERR:       {
STDERR:         "index": 0,
STDERR:         "clientDebugName": "LayoutView #document",
STDERR:         "id": "0x85e56f49218:ForeignLayerWrapper:0",
STDERR:         "visualRect": "0,0 800x600",
STDERR:         "layer": 292
STDERR:       }
STDERR:     ]
STDERR:   },
STDERR:   {
STDERR:     "chunk": "LayoutIFrame IFRAME id='f' 0x85e56f49b18:ForeignLayerWrapper:0",
STDERR:     "state": "t:0x85e56fa9b90 c:0x85e56f9dc30 e:0x85e56f541f0",
STDERR:     "displayItems": [
STDERR:       {
STDERR:         "index": 1,
STDERR:         "clientDebugName": "LayoutIFrame IFRAME id='f'",
STDERR:         "id": "0x85e56f49b18:ForeignLayerWrapper:0",
STDERR:         "visualRect": "0,0 800x600",
STDERR:         "layer": 303
STDERR:       }
STDERR:     ]
STDERR:   },
STDERR:   {
STDERR:     "chunk": "Scrolling Contents Layer 0x85e56f4f098:ForeignLayerWrapper:0",
STDERR:     "state": "t:0x85e56facd10 c:0x85e56f9d690 e:0x85e56f541f0",
STDERR:     "displayItems": [
STDERR:       {
STDERR:         "index": 2,
STDERR:         "clientDebugName": "Scrolling Contents Layer",
STDERR:         "id": "0x85e56f4f098:ForeignLayerWrapper:0",
STDERR:         "visualRect": "0,0 2008x2016",
STDERR:         "layer": 296
STDERR:       }
STDERR:     ]
STDERR:   },
STDERR:   {
STDERR:     "chunk": "Horizontal Scrollbar Layer 0x85e56f4ba98:ForeignLayerWrapper:0",
STDERR:     "state": "t:0x85e56facbb0 c:0x85e56f9dc30 e:0x85e56f541f0",
STDERR:     "displayItems": [
STDERR:       {
STDERR:         "index": 3,
STDERR:         "clientDebugName": "Horizontal Scrollbar Layer",
STDERR:         "id": "0x85e56f4ba98:ForeignLayerContentsWrapper:0",
STDERR:         "visualRect": "0,585 785x15",
STDERR:         "layer": 298
STDERR:       }
STDERR:     ]
STDERR:   },
STDERR:   {
STDERR:     "chunk": "Vertical Scrollbar Layer 0x85e56f4c5d8:ForeignLayerWrapper:0",
STDERR:     "state": "t:0x85e56facbb0 c:0x85e56f9dc30 e:0x85e56f541f0",
STDERR:     "displayItems": [
STDERR:       {
STDERR:         "index": 4,
STDERR:         "clientDebugName": "Vertical Scrollbar Layer",
STDERR:         "id": "0x85e56f4c5d8:ForeignLayerContentsWrapper:0",
STDERR:         "visualRect": "785,0 15x585",
STDERR:         "layer": 300
STDERR:       }
STDERR:     ]
STDERR:   },
STDERR:   {
STDERR:     "chunk": "Scroll Corner Layer 0x85e56f4ced8:ForeignLayerWrapper:0",
STDERR:     "state": "t:0x85e56facbb0 c:0x85e56f9dc30 e:0x85e56f541f0",
STDERR:     "displayItems": [
STDERR:       {
STDERR:         "index": 5,
STDERR:         "clientDebugName": "Scroll Corner Layer",
STDERR:         "id": "0x85e56f4ced8:ForeignLayerWrapper:0",
STDERR:         "visualRect": "785,585 15x15",
STDERR:         "layer": 301
STDERR:       }
STDERR:     ]
STDERR:   }
STDERR: ]
STDERR: 
STDERR: [1:1:0509/132040.086069:FATAL:paint_controller.cc(1188)] Check failed: false. New paint chunk id 0x85e56f4ba98:ForeignLayerWrapper:0 has duplicated id with previous chuck PaintChunk(begin=3, end=4, id=0x85e56f4ba98:ForeignLayerWrapper:0 cacheable=1 props=(t:0x85e56facbb0 c:0x85e56f9dc30 e:0x85e56f541f0) bounds=0,0 0x0 known_to_be_opaque=0)
STDERR: #0 0x7f4267f229bd base::debug::StackTrace::StackTrace()
STDERR: #1 0x7f4267c4c4bc base::debug::StackTrace::StackTrace()
STDERR: #2 0x7f4267cbdfaa logging::LogMessage::~LogMessage()
STDERR: #3 0x7f4255a901a9 blink::PaintController::CheckDuplicatePaintChunkId()
STDERR: #4 0x7f425831505f blink::PaintController::UpdateCurrentPaintChunkProperties()
STDERR: #5 0x7f4258314e49 blink::ScopedPaintChunkProperties::ScopedPaintChunkProperties()
STDERR: #6 0x7f42582ff77f blink::CollectDrawableLayersForLayerListRecursively()
STDERR: #7 0x7f42582fe57a blink::LocalFrameView::PaintTree()
STDERR: #8 0x7f42582fbe22 blink::LocalFrameView::UpdateLifecyclePhasesInternal()
STDERR: #9 0x7f42582fb1a2 blink::LocalFrameView::UpdateAllLifecyclePhases()
STDERR: #10 0x7f4258b9a11b blink::PageAnimator::UpdateAllLifecyclePhases()
STDERR: #11 0x7f4258b9f9bc blink::PageWidgetDelegate::UpdateLifecycle()
STDERR: #12 0x7f42581e33a8 blink::WebViewImpl::UpdateLifecycle()
STDERR: #13 0x7f42581b7f9b blink::WebWidget::UpdateAllLifecyclePhases()
STDERR: #14 0x7f4252d22b1b test_runner::EventSender::MouseMoveTo()
STDERR: #15 0x7f4252d1f20d test_runner::EventSenderBindings::MouseMoveTo()
STDERR: #16 0x7f4252d44b00 _ZN4base8internal13FunctorTraitsIMN11test_runner19EventSenderBindingsEFvPN3gin9ArgumentsEEvE6InvokeIS8_PS3_JS6_EEEvT_OT0_DpOT1_
STDERR: #17 0x7f4252d44a5f _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMN11test_runner19EventSenderBindingsEFvPN3gin9ArgumentsEEJPS5_S8_EEEvOT_DpOT0_
STDERR: #18 0x7f4252d449f1 _ZN4base8internal7InvokerINS0_9BindStateIMN11test_runner19EventSenderBindingsEFvPN3gin9ArgumentsEEJEEEFvPS4_S7_EE7RunImplIRKS9_RKNSt3__15tupleIJEEEJEEEvOT_OT0_NSH_16integer_sequenceImJXspT1_EEEEOSB_OS7_
STDERR: #19 0x7f4252d449a4 _ZN4base8internal7InvokerINS0_9BindStateIMN11test_runner19EventSenderBindingsEFvPN3gin9ArgumentsEEJEEEFvPS4_S7_EE3RunEPNS0_13BindStateBaseESB_S7_
STDERR: #20 0x7f4252d44946 _ZNKR4base17RepeatingCallbackIFvPN11test_runner19EventSenderBindingsEPN3gin9ArgumentsEEE3RunES3_S6_
STDERR: #21 0x7f4252d44872 _ZN3gin8internal7InvokerINSt3__116integer_sequenceImJLm0ELm1EEEEJPN11test_runner19EventSenderBindingsEPNS_9ArgumentsEEE18DispatchToCallbackEN4base17RepeatingCallbackIFvS7_S9_EEE
STDERR: #22 0x7f4252d4471e gin::internal::Dispatcher<>::DispatchToCallback()
STDERR: #23 0x7f425a2936f3 v8::internal::FunctionCallbackArguments::Call()
STDERR: #24 0x7f425a291a43 v8::internal::(anonymous namespace)::HandleApiCallHelper<>()
STDERR: #25 0x7f425a28fdf9 v8::internal::Builtin_Impl_HandleApiCall()
STDERR: #26 0x7f425a28f83d v8::internal::Builtin_HandleApiCall()
STDERR: #27 0x3a6b401abd24 <unknown>
STDERR: