Add patheffects to debugger printout

src/effects/SkCornerPathEffect.cpp

Index: src/effects/SkCornerPathEffect.cpp
diff --git a/src/effects/SkCornerPathEffect.cpp b/src/effects/SkCornerPathEffect.cpp
index 31f55a3901e22b5502e843d78d5c709ccd484d04..79d4c4cbd3a1710d1bea4f3e56a10a5d1328d834 100644
--- a/src/effects/SkCornerPathEffect.cpp
+++ b/src/effects/SkCornerPathEffect.cpp
@@ -146,3 +146,11 @@ SkFlattenable* SkCornerPathEffect::CreateProc(SkReadBuffer& buffer) {
 void SkCornerPathEffect::flatten(SkWriteBuffer& buffer) const {
     buffer.writeScalar(fRadius);
 }
+
+#ifndef SK_IGNORE_TO_STRING
+void SkCornerPathEffect::toString(SkString* str) const {
+    str->appendf("SkCornerPathEffect: (");
+    str->appendf("radius: %.2f", fRadius);
+    str->appendf(")");
+}
+#endif