Add toString methods to SkImageFilter-derived classes

src/effects/SkMorphologyImageFilter.cpp

Index: src/effects/SkMorphologyImageFilter.cpp
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index d533448fe00ff6d99fabf0c9316705f73a968018..d18dc394eb93072545664650eca13d5fa3a0f344 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -264,6 +264,22 @@ SkFlattenable* SkDilateImageFilter::CreateProc(SkReadBuffer& buffer) {
     return Create(width, height, common.getInput(0), &common.cropRect(), common.uniqueID());
 }
 
+#ifndef SK_IGNORE_TO_STRING
+void SkErodeImageFilter::toString(SkString* str) const {
+    str->appendf("SkErodeImageFilter: (");
+    str->appendf("radius: (%d,%d)", this->radius().fWidth, this->radius().fHeight);
+    str->append(")");
+}
+#endif
+
+#ifndef SK_IGNORE_TO_STRING
+void SkDilateImageFilter::toString(SkString* str) const {
+    str->appendf("SkDilateImageFilter: (");
+    str->appendf("radius: (%d,%d)", this->radius().fWidth, this->radius().fHeight);
+    str->append(")");
+}
+#endif
+
 #if SK_SUPPORT_GPU
 
 ///////////////////////////////////////////////////////////////////////////////