Stack trace:

[1:1:0316/210340:FATAL:blimp_image_serialization_processor.cc(53)] Check failed: pixmap.alphaType() == kPremul_SkAlphaType. 
#0 0x7fe14e05e1fe base::debug::StackTrace::StackTrace()
#1 0x7fe14e0be7df logging::LogMessage::~LogMessage()
#2 0x7fe14f6778dd (anonymous namespace)::WebPImageEncoder::onEncode()
#3 0x7fe14e8ae0af SkPixelSerializer::encode()
#4 0x7fe14e8bcfa8 SkImage::encode()
#5 0x7fe14e8ad670 SkWriteBuffer::writeImage()
#6 0x7fe14e822e48 SkPictureData::flattenToBuffer()
#7 0x7fe14e823045 SkPictureData::serialize()
#8 0x7fe14e81fac0 SkPicture::serialize()
#9 0x7fe14e81f9f9 SkPicture::serialize()
#10 0x7fe14f219644 cc::DrawingDisplayItem::ToProtobuf()
#11 0x7fe14f20fea3 cc::DisplayItemList::ToProtobuf()
#12 0x7fe14f2177e1 cc::DisplayListRecordingSource::ToProtobuf()
#13 0x7fe14f158f84 cc::PictureLayer::LayerSpecificPropertiesToProto()
#14 0x7fe14f123b51 cc::Layer::ToLayerPropertiesProto()
#15 0x7fe14f14aff0 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#16 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#17 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#18 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#19 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#20 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#21 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#22 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#23 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#24 0x7fe14f14b079 cc::LayerProtoConverter::RecursivelySerializeLayerProperties()
#25 0x7fe14f14afbd cc::LayerProtoConverter::SerializeLayerProperties()
#26 0x7fe14f345fff cc::LayerTreeHost::ToProtobufForCommit()
#27 0x7fe14f4051c9 cc::RemoteChannelMain::StartCommitOnImpl()
#28 0x7fe14f3f2877 cc::ProxyMain::BeginMainFrame()
#29 0x7fe14f404906 cc::RemoteChannelMain::HandleProto()
#30 0x7fe14f40462f cc::RemoteChannelMain::OnProtoReceived()
#31 0x7fe14bb94490 content::RenderWidgetCompositor::OnHandleCompositorProto()
#32 0x7fe14bd1d57d content::RenderWidget::OnHandleCompositorProto()