Update error-handling for fe*Lighting and feTurbulence

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

Index: third_party/WebKit/Source/platform/graphics/filters/FETurbulence.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/filters/FETurbulence.cpp b/third_party/WebKit/Source/platform/graphics/filters/FETurbulence.cpp
index 64644165294bd4fb894f1838683e6ef208f590e1..1781eb0b2094a57e2716fa7d3f855977d8a66fe4 100644
--- a/third_party/WebKit/Source/platform/graphics/filters/FETurbulence.cpp
+++ b/third_party/WebKit/Source/platform/graphics/filters/FETurbulence.cpp
@@ -149,6 +149,9 @@ SkShader* FETurbulence::createShader()
 
 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));