After an attempt to make PointerEventManager a GC object to the purpose using postTask, Chrome crashes every time EventHandler gets destroyed:

ASSERTION FAILED: m_thread == currentThread()
../../third_party/WebKit/Source/platform/Timer.h(216) : bool
blink::TimerBase::isActive() const
1   0x7f58de7987d7
2   0x7f58df017f15 blink::EventHandler::~EventHandler()
3   0x7f58df025275
4   0x7f58df025255
5   0x7f58df025235
6   0x7f58ea8624c1 blink::HeapObjectHeader::finalize(unsigned char*, unsigned
long)
7   0x7f58ea8670c8
8   0x7f58ea863389 blink::BaseArena::sweepUnsweptPage()
9   0x7f58ea86356e blink::BaseArena::lazySweepWithDeadline(double)
10  0x7f58ea8713f9 blink::ThreadState::performIdleLazySweep(double)
11  0x7f58ea8785da
12  0x7f58ea878516
13  0x7f58ea8784a7
14  0x7f58ea8783fc
15  0x7f58ea406b54
16  0x7f58ea406a84
17  0x7f58ea40683b
18  0x7f58e3367a65
scheduler::WebSchedulerImpl::runIdleTask(std::unique_ptr<blink::WebThread::IdleTask,
std::default_delete<blink::WebThread::IdleTask> >, base::TimeTicks)
19  0x7f58e336914f
20  0x7f58e336909d
21  0x7f58e3369037
22  0x7f58e3368dfc
23  0x7f58e3366996
24  0x7f58e336635a
25  0x7f58e3366f78
26  0x7f58e3366e7f
27  0x7f58e3366df3
28  0x7f58e3366b6c
29  0x7f58f7f4a39e
30  0x7f58f7f6ff9e base::debug::TaskAnnotator::RunTask(char const*,
base::PendingTask const&)
31  0x7f58e3340a94
scheduler::TaskQueueManager::ProcessTaskFromWorkQueue(scheduler::internal::WorkQueue*,
scheduler::internal::TaskQueueImpl::Task*)


We need to make PointerEventManager a GC managed object to use postTask cleanly instead of delegating the task to EventHandler.