Matrix convolution bounds fix; affectsTransparentBlack fixes.

src/effects/SkMatrixConvolutionImageFilter.cpp

Index: src/effects/SkMatrixConvolutionImageFilter.cpp
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index e58eec10f4e25d99c2fff2a262b232ea9bbda72b..7c5dd8368f439e528ca06691d3f9ff3bb9273ad0 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -335,6 +335,12 @@ bool SkMatrixConvolutionImageFilter::onFilterBounds(const SkIRect& src, const Sk
     return true;
 }
 
+bool SkMatrixConvolutionImageFilter::canComputeFastBounds() const {
+    // Because the kernel is applied in device-space, we have no idea what
+    // pixels it will affect in object-space.
+    return false;
+}
+
 #if SK_SUPPORT_GPU
 
 static GrTextureDomain::Mode convert_tilemodes(