Update error-handling for fe*Lighting and feTurbulence

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Renata Hodovan <reni@inf.u-szeged.hu>
  * Copyright (C) 2011 Gabor Loki <loki@webkit.org>
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 131 matching lines @@
         SkPerlinNoiseShader::CreateFractalNoise(SkFloatToScalar(baseFrequencyX),
             SkFloatToScalar(baseFrequencyY), numOctaves(), SkFloatToScalar(seed()),
             stitchTiles() ? &size : 0) :
         SkPerlinNoiseShader::CreateTurbulence(SkFloatToScalar(baseFrequencyX),
             SkFloatToScalar(baseFrequencyY), numOctaves(), SkFloatToScalar(seed()),
             stitchTiles() ? &size : 0);
 }
 
 PassRefPtr<SkImageFilter> FETurbulence::createImageFilter(SkiaImageFilterBuilder* builder)
 {
+    if (m_baseFrequencyX < 0 || m_baseFrequencyY < 0)
+        return createTransparentBlack(builder);
+
     SkAutoTUnref<SkShader> shader(createShader());
     SkImageFilter::CropRect rect = getCropRect(builder->cropOffset());
     return adoptRef(SkRectShaderImageFilter::Create(shader, &rect));
 }
 
 static TextStream& operator<<(TextStream& ts, const TurbulenceType& type)
 {
     switch (type) {
     case FETURBULENCE_TYPE_UNKNOWN:
         ts << "UNKNOWN";
@@ skipping 15 matching lines @@
     FilterEffect::externalRepresentation(ts);
     ts << " type=\"" << type() << "\" "
        << "baseFrequency=\"" << baseFrequencyX() << ", " << baseFrequencyY() << "\" "
        << "seed=\"" << seed() << "\" "
        << "numOctaves=\"" << numOctaves() << "\" "
        << "stitchTiles=\"" << stitchTiles() << "\"]\n";
     return ts;
 }
 
 } // namespace blink