Update error-handling for fe*Lighting and feTurbulence

third_party/WebKit/Source/platform/graphics/filters/FELighting.cpp

 /*
  * Copyright (C) 2010 University of Szeged
  * Copyright (C) 2010 Zoltan Herczeg
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 43 matching lines @@
 FloatRect FELighting::mapPaintRect(const FloatRect& rect, bool)
 {
     FloatRect result = rect;
     // The areas affected need to be a pixel bigger to accommodate the Sobel kernel.
     result.inflate(1);
     return result;
 }
 
 PassRefPtr<SkImageFilter> FELighting::createImageFilter(SkiaImageFilterBuilder* builder)
 {
+    if (!m_lightSource)
+        return createTransparentBlack(builder);
+
     SkImageFilter::CropRect rect = getCropRect(builder ? builder->cropOffset() : FloatSize());
     Color lightColor = adaptColorToOperatingColorSpace(m_lightingColor);
     RefPtr<SkImageFilter> input(builder ? builder->build(inputEffect(0), operatingColorSpace()) : nullptr);
     switch (m_lightSource->type()) {
     case LS_DISTANT: {
         DistantLightSource* distantLightSource = static_cast<DistantLightSource*>(m_lightSource.get());
         float azimuthRad = deg2rad(distantLightSource->azimuth());
         float elevationRad = deg2rad(distantLightSource->elevation());
         const SkPoint3 direction = SkPoint3::Make(cosf(azimuthRad) * cosf(elevationRad), sinf(azimuthRad) * cosf(elevationRad), sinf(elevationRad));
         if (m_specularConstant > 0)
@@ skipping 20 matching lines @@
             return adoptRef(SkLightingImageFilter::CreateSpotLitSpecular(location, target, specularExponent, limitingConeAngle, lightColor.rgb(), m_surfaceScale, m_specularConstant, m_specularExponent, input.get(), &rect));
         return adoptRef(SkLightingImageFilter::CreateSpotLitDiffuse(location, target, specularExponent, limitingConeAngle, lightColor.rgb(), m_surfaceScale, m_diffuseConstant, input.get(), &rect));
     }
     default:
         ASSERT_NOT_REACHED();
         return nullptr;
     }
 }
 
 } // namespace blink