This looks like that a throttled frame is focused and computation of selection causes unexpected lifecycle state.

skyostil@ can you take a look?

Copied from bug 601001  #20 :

ToT on Windows hits following assertion after running 3 minutes 30 seconds on debug build:

```
CompositingState PaintLayer::compositingState() const
{
    ASSERT(isAllowedToQueryCompositingState());
```

I don't have enough information about graphics layer. Paint team, could you take look?

# Stack trace here:
blink::PaintLayer::compositingState() Line 2267
blink::LayoutObject::localToInvalidationBackingPoint(const blink::LayoutPoint & localPoint, blink::PaintLayer * * backingLayer) Line 2406
blink::RenderedPosition::positionInGraphicsLayerBacking(blink::CompositedSelectionBound & bound, bool selectionStart) Line 249
blink::FrameView::computeCompositedSelection(blink::LocalFrame & frame, blink::CompositedSelection & selection) Line 1631
blink::FrameView::updateCompositedSelectionIfNeeded() Line 1665
blink::FrameView::updateLifecyclePhasesInternal(blink::FrameView::LifeCycleUpdateOption phases) Line 2438
blink::FrameView::updateAllLifecyclePhases() Line 2372
blink::PageAnimator::updateAllLifecyclePhases(blink::LocalFrame & rootFrame) Line 85
blink_web.dll!blink::PageWidgetDelegate::updateAllLifecyclePhases(blink::Page & page, blink::LocalFrame & root) Line 63
blink_web.dll!blink::WebViewImpl::updateAllLifecyclePhases() Line 1981
content.dll!content::RenderWidget::UpdateVisualState() Line 941
content.dll!content::RenderWidgetCompositor::UpdateLayerTreeHost() Line 920
cc.dll!cc::LayerTreeHost::RequestMainFrameUpdate() Line 397
cc.dll!cc::ProxyMain::BeginMainFrame(std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> > begin_main_frame_state) Line 202
cc.dll!base::internal::RunnableAdapter<void (__cdecl cc::ProxyMain::*)(std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> >) __ptr64>::Run<std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> > >(cc::ProxyMain * object, std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> > && <args_0>) Line 182
cc.dll!base::internal::InvokeHelper<1,void,base::internal::RunnableAdapter<void (__cdecl cc::ProxyMain::*)(std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> >) __ptr64> >::MakeItSo<base::WeakPtr<cc::ProxyMain>,std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> > >(base::internal::RunnableAdapter<void (__cdecl cc::ProxyMain::*)(std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> >)> runnable, base::WeakPtr<cc::ProxyMain> weak_ptr, std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> > && <args_0>) Line 325
cc.dll!base::internal::Invoker<base::IndexSequence<0,1>,base::internal::BindState<base::internal::RunnableAdapter<void (__cdecl cc::ProxyMain::*)(std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> >) __ptr64>,void __cdecl(cc::ProxyMain * __ptr64,std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> >),base::WeakPtr<cc::ProxyMain> & __ptr64,base::internal::PassedWrapper<std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> > > >,base::internal::InvokeHelper<1,void,base::internal::RunnableAdapter<void (__cdecl cc::ProxyMain::*)(std::unique_ptr<cc::BeginMainFrameAndCommitState,std::default_delete<cc::BeginMainFrameAndCommitState> >) __ptr64> >,void __cdecl(void)>::Run(base::internal::BindStateBase * base) Line 362
base.dll!base::Callback<void __cdecl(void),1>::Run() Line 398
base.dll!base::debug::TaskAnnotator::RunTask(const char * queue_function, const base::PendingTask & pending_task) Line 53
scheduler.dll!scheduler::TaskQueueManager::ProcessTaskFromWorkQueue(scheduler::internal::WorkQueue * work_queue, scheduler::internal::TaskQueueImpl::Task * out_previous_task) Line 293
scheduler.dll!scheduler::TaskQueueManager::DoWork(base::TimeTicks run_time, bool from_main_thread) Line 201
scheduler.dll!base::internal::RunnableAdapter<void (__cdecl scheduler::TaskQueueManager::*)(base::TimeTicks,bool) __ptr64>::Run<base::TimeTicks const & __ptr64,bool const & __ptr64>(scheduler::TaskQueueManager * object, const base::TimeTicks & <args_0>, const bool & <args_1>) Line 182
scheduler.dll!base::internal::InvokeHelper<1,void,base::internal::RunnableAdapter<void (__cdecl scheduler::TaskQueueManager::*)(base::TimeTicks,bool) __ptr64> >::MakeItSo<base::WeakPtr<scheduler::TaskQueueManager>,base::TimeTicks const & __ptr64,bool const & __ptr64>(base::internal::RunnableAdapter<void (__cdecl scheduler::TaskQueueManager::*)(base::TimeTicks,bool)> runnable, base::WeakPtr<scheduler::TaskQueueManager> weak_ptr, const base::TimeTicks & <args_0>, const bool & <args_1>) Line 325
scheduler.dll!base::internal::Invoker<base::IndexSequence<0,1,2>,base::internal::BindState<base::internal::RunnableAdapter<void (__cdecl scheduler::TaskQueueManager::*)(base::TimeTicks,bool) __ptr64>,void __cdecl(scheduler::TaskQueueManager * __ptr64,base::TimeTicks,bool),base::WeakPtr<scheduler::TaskQueueMa