Image filters: force near-zero floating point parameters to zero.

src/effects/SkMatrixConvolutionImageFilter.cpp

Index: src/effects/SkMatrixConvolutionImageFilter.cpp
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index 5e5f20ba8ff4200fe1d4a85b53089e6ae6fdffe7..3eb7a0b5d44e4446e8b11d24cebb4bdd36c25f7d 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -36,14 +36,16 @@ SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& ke
                                                                const CropRect* cropRect)
     : INHERITED(&input, 1, cropRect)
     , fKernelSize(kernelSize)
-    , fGain(gain)
-    , fBias(bias)
+    , fGain(SkScalarNormalize(gain))
+    , fBias(SkScalarNormalize(bias))
     , fKernelOffset(kernelOffset)
     , fTileMode(tileMode)
     , fConvolveAlpha(convolveAlpha) {
     size_t size = (size_t) sk_64_mul(fKernelSize.width(), fKernelSize.height());
     fKernel = new SkScalar[size];
-    memcpy(fKernel, kernel, size * sizeof(SkScalar));
+    for (size_t i = 0; i < size; ++i) {
+        fKernel[i] = SkScalarNormalize(kernel[i]);
+    }
     SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1);
     SkASSERT(kernelOffset.fX >= 0 && kernelOffset.fX < kernelSize.fWidth);
     SkASSERT(kernelOffset.fY >= 0 && kernelOffset.fY < kernelSize.fHeight);