Add patheffects to debugger printout

src/effects/SkArcToPathEffect.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkArcToPathEffect.h"
 #include "SkPath.h"
 #include "SkPoint.h"
@@ skipping 50 matching lines @@
     return true;
 }
 
 SkFlattenable* SkArcToPathEffect::CreateProc(SkReadBuffer& buffer) {
     return SkArcToPathEffect::Create(buffer.readScalar());
 }
 
 void SkArcToPathEffect::flatten(SkWriteBuffer& buffer) const {
     buffer.writeScalar(fRadius);
 }
+
+#ifndef SK_IGNORE_TO_STRING
+void SkArcToPathEffect::toString(SkString* str) const {
+    str->appendf("SkArcToPathEffect: (");
+    str->appendf("radius: %f", fRadius);
+    str->appendf(")");
+}
+#endif