We collected slow reports from users facing janks and found that the function mentioned above is taking too much time on the main thread, potentially causing janks at startup

The stack trace that was hit the most:
Unknown
deflate_slow
Cr_z_deflate
compression::GzipCompress(base::BasicStringPiece<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >*)
variations::VariationsSeedStore::VerifyAndCompressSeedData(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, bool, variations::VariationsSeedStore::SeedType, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >*, variations::VariationsSeed*)
variations::VariationsSeedStore::StoreSafeSeed(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, variations::ClientFilterableState const&, base::Time)
variations::SafeSeedManager::RecordSuccessfulFetch(variations::VariationsSeedStore*)
variations::VariationsService::OnSimpleLoaderComplete(std::__ndk1::unique_ptr<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::default_delete<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > > >)
...
base::OnceCallback<void (bool)>::Run(bool) &&
network::(anonymous namespace)::SaveToStringBodyHandler::NotifyConsumerOfCompletion(bool)
network::(anonymous namespace)::SimpleURLLoaderImpl::FinishWithResult(int)
network::mojom::URLLoaderClientStubDispatch::Accept(network::mojom::URLLoaderClient*, mojo::Message*)
mojo::internal::MultiplexRouter::ProcessIncomingMessage(mojo::internal::MultiplexRouter::MessageWrapper*, mojo::internal::MultiplexRouter::ClientCallBehavior, base::SequencedTaskRunner*)
mojo::internal::MultiplexRouter::Accept(mojo::Message*)
mojo::Connector::ReadSingleMessage(unsigned int*)
mojo::Connector::ReadAllAvailableMessages()
void base::internal::Invoker<base::internal::BindState<void (net::HostResolverImpl::LegacyRequestImpl::*)(int), base::internal::UnretainedWrapper<net::HostResolverImpl::LegacyRequestImpl> >, void (int)>::RunImpl<void (net::HostResolverImpl::LegacyRequestImpl::*)(int), std::__ndk1::tuple<base::internal::UnretainedWrapper<net::HostResolverImpl::LegacyRequestImpl> >, 0u>(void (net::HostResolverImpl::LegacyRequestImpl::*&&)(int), std::__ndk1::tuple<base::internal::UnretainedWrapper<net::HostResolverImpl::LegacyRequestImpl> >&&, std::__ndk1::integer_sequence<unsigned int, 0u>, int&&)
base::internal::Invoker<base::internal::BindState<void (net::HostResolverImpl::LegacyRequestImpl::*)(int), base::internal::UnretainedWrapper<net::HostResolverImpl::LegacyRequestImpl> >, void (int)>::RunOnce(base::internal::BindStateBase*, int)
mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&)
...
base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)
base::MessageLoop::RunTask(base::PendingTask*)
base::MessageLoop::DoWork()
base::MessagePumpForUI::OnNonDelayedLooperCallback()
base::(anonymous namespace)::NonDelayedLooperCallback(int, int, void*)