Provide correct saveLayer() bounds in FEGaussianBlur, FEMorphology.

Source/platform/graphics/filters/FEMorphology.cpp

Index: Source/platform/graphics/filters/FEMorphology.cpp
diff --git a/Source/platform/graphics/filters/FEMorphology.cpp b/Source/platform/graphics/filters/FEMorphology.cpp
index 3c9b121b6dc8de2240926b42d419ffdc7c8da1f9..d5322f3eae212f1e8b3ba7819819d1dc5caacc84 100644
--- a/Source/platform/graphics/filters/FEMorphology.cpp
+++ b/Source/platform/graphics/filters/FEMorphology.cpp
@@ -244,7 +244,8 @@ bool FEMorphology::applySkia()
     else if (m_type == FEMORPHOLOGY_OPERATOR_ERODE)
         paint.setImageFilter(new SkErodeImageFilter(radiusX, radiusY))->unref();
 
-    dstContext->saveLayer(0, &paint);
+    SkRect bounds = SkRect::MakeWH(absolutePaintRect().width(), absolutePaintRect().height());
+    dstContext->saveLayer(&bounds, &paint);
     dstContext->drawImage(image.get(), drawingRegion.location(), CompositeCopy);
     dstContext->restoreLayer();
     return true;