H/V_LINE_TO commands can have two coordinates

[kreichgauer]

SVG's horizontal/vertical lineto commands may have multiple coordinates (although the spec caveats that "usually this doesn't make sense"). Skiafy will convert those to V/H_LINE_TO commands with up to two coordinates. But Chromium thinks they may have only one: https://source.chromium.org/chromium/chromium/src/+/main:ui/gfx/paint_vector_icon.cc;l=114-119;drc=3e1a26c44c024d97dc9a4c09bbc6a2365398ca2c

[jamescookmd]

Specifically, some SVGs generate commands in .icon files like "R_V_LINE_TO, -9, 9,". This causes a NOTREACHED() in paint_vector_icon.cc:

#0 0x7f1eaf424a4c base::debug::CollectStackTrace()
#1 0x7f1eaf3de43a base::debug::StackTrace::StackTrace()
#2 0x7f1eaf3de3f5 base::debug::StackTrace::StackTrace()
#3 0x7f1eaf12658e logging::LogMessage::~LogMessage()
#4 0x7f1eaf0dc7fc logging::(anonymous namespace)::NotReachedLogMessage::~NotReachedLogMessage()
#5 0x7f1eaf0dc829 logging::(anonymous namespace)::NotReachedLogMessage::~NotReachedLogMessage()
#6 0x7f1eaf0dc0cd logging::CheckError::~CheckError()
#7 0x7f1eaf0dc225 logging::NotReachedError::~NotReachedError()
#8 0x7f1eadb59aca gfx::(anonymous namespace)::PathParser::GetArgumentCount()
#9 0x7f1eadb59879 gfx::(anonymous namespace)::PathParser::Advance()
#10 0x7f1eadb58ec7 gfx::(anonymous namespace)::PaintPath()
#11 0x7f1eadb57c39 gfx::PaintVectorIcon()
#12 0x7f1eadb5a24a gfx::(anonymous namespace)::VectorIconSource::Draw()
#13 0x7f1eadb3b47a gfx::CanvasImageSource::GetImageForScale()
#14 0x7f1eadaf4062 gfx::internal::ImageSkiaStorage::FindRepresentation()
#15 0x7f1eadaf5604 gfx::ImageSkia::GetRepresentation()
#16 0x7f1e9beeac70 views::ImageView::GetPaintImage()
#17 0x7f1e9beea821 views::ImageView::OnPaintImage()
#18 0x7f1e9beea784 views::ImageView::OnPaint()
#19 0x7f1e9c0b3c0a views::View::Paint()
#20 0x7f1e9c0b86e0 views::View::RecursivePaintHelper()
#21 0x7f1e9c0b84de views::View::PaintChildren()
#22 0x7f1e9c0b3cd1 views::View::Paint()
#23 0x7f1e9c0b86e0 views::View::RecursivePaintHelper()
#24 0x7f1e9c0b84de views::View::PaintChildren()
#25 0x7f1e9c0b3cd1 views::View::Paint()
#26 0x7f1e9c0b86e0 views::View::RecursivePaintHelper()
#27 0x7f1e9c0b84de views::View::PaintChildren()
#28 0x7f1e9c0b3cd1 views::View::Paint()
#29 0x7f1e9c0b86e0 views::View::RecursivePaintHelper()
#30 0x7f1e9c0b84de views::View::PaintChildren()
#31 0x7f1e9c0b3cd1 views::View::Paint()
#32 0x7f1e9c0b959b views::View::PaintFromPaintRoot()
#33 0x7f1e9c0b94dd views::View::OnPaintLayer()
#34 0x7f1e9c931a5e ui::Layer::PaintContentsToDisplayList()
#35 0x7f1e9c931b99 ui::Layer::PaintContentsToDisplayList()
#36 0x7f1e9e1fcfc1 cc::PictureLayer::Update()
#37 0x7f1e9e48149d cc::LayerTreeHost::PaintContent()
#38 0x7f1e9e4806d0 cc::LayerTreeHost::DoUpdateLayers()
#39 0x7f1e9e47fa54 cc::LayerTreeHost::UpdateLayers()
#40 0x7f1e9e5be479 cc::SingleThreadProxy::DoPainting()
#41 0x7f1e9e5bf91d cc::SingleThreadProxy::BeginMainFrame()
#42 0x7f1e9e5c2127 base::internal::FunctorTraits<>::Invoke<>()
#43 0x7f1e9e5c2073 base::internal::InvokeHelper<>::MakeItSo<>()
#44 0x7f1e9e5c1fcd _ZN4base8internal7InvokerINS0_9BindStateIMN2cc17SingleThreadProxyEFvRKN3viz14BeginFrameArgsEEJNS_7WeakPtrIS4_EES6_EEEFvvEE7RunImplISA_NSt2Cr5tupleIJSC_S6_EEEJLm0ELm1EEEEvOT_OT0_NSH_16integer_sequenceImJXspT1_EEEE
#45 0x7f1e9e5c1f41 base::internal::Invoker<>::RunOnce()
#46 0x7f1eaf0d23b8 _ZNO4base12OnceCallbackIFvvEE3RunEv
#47 0x7f1eaf28d25a base::TaskAnnotator::RunTaskImpl()
#48 0x7f1eaf2e682b base::TaskAnnotator::RunTask<>()
#49 0x7f1eaf2e64d7 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWorkImpl()
#50 0x7f1eaf2e58d1 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWork()
#51 0x7f1eaf2e67a3 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWork()
#52 0x7f1eaf439567 base::MessagePumpLibevent::Run()
#53 0x7f1eaf2e6ea5 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::Run()
#54 0x7f1eaf2025f2 base::RunLoop::Run()
#55 0x7f1e8cdd9e9c content::BrowserMainLoop::RunMainMessageLoop()
#56 0x7f1e8cde657b content::BrowserMainRunnerImpl::Run()
#57 0x7f1e8cdd5f62 content::BrowserMain()
#58 0x7f1e90421ffa content::RunBrowserProcessMain()
#59 0x7f1e90423d8e content::ContentMainRunnerImpl::RunBrowser()
#60 0x7f1e904235b6 content::ContentMainRunnerImpl::Run()
#61 0x7f1e904202ef content::RunContentProcess()
#62 0x7f1e904208eb content::ContentMain()
#63 0x561771bec8bb ChromeMain
#64 0x561771bec632 main