Allow toString capability to be toggled independent of developer mode

src/effects/SkAvoidXfermode.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAvoidXfermode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
@@ skipping 149 matching lines @@
             dst[i] = SkBlend3216(src[i], dst[i], d);
         }
     }
 }
 
 void SkAvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count,
                              const SkAlpha aa[]) const {
     // override in subclass
 }
 
-#ifdef SK_DEVELOPER
+#ifndef SK_IGNORE_TO_STRING
 void SkAvoidXfermode::toString(SkString* str) const {
     str->append("SkAvoidXfermode: opColor: ");
     str->appendHex(fOpColor);
     str->appendf("distMul: %d ", fDistMul);
 
     static const char* gModeStrings[] = { "Avoid", "Target" };
 
     str->appendf("mode: %s", gModeStrings[fMode]);
 }
 #endif