Define NDEBUG instead of SK_DEBUG/SK_RELEASE.

bench/nanobench.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 <ctype.h>
 
 #include "Benchmark.h"
@@ skipping 596 matching lines @@
         create_targets(&targets, bench.get(), configs);
 
         if (!targets.isEmpty()) {
             log.bench(bench->getName(), bench->getSize().fX, bench->getSize().fY);
             bench->preDraw();
         }
         for (int j = 0; j < targets.count(); j++) {
             SkCanvas* canvas = targets[j]->surface.get() ? targets[j]->surface->getCanvas() : NULL;
             const char* config = targets[j]->config.name;
 
-#if SK_DEBUG
+#ifdef SK_DEBUG
             // skia:2797  Some SKPs SkASSERT in debug mode.  Skip them for now.
             if (0 == strcmp("565", config) && SkStrContains(bench->getName(), ".skp")) {
                 SkDebugf("Skipping 565 %s.  See skia:2797\n", bench->getName());
                 continue;
             }
 #endif
 
             const int loops =
 #if SK_SUPPORT_GPU
                 Benchmark::kGPU_Backend == targets[j]->config.backend
@@ skipping 72 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif