Spin off GM::runAsBench() from flags.

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 485 matching lines @@
             Benchmark* bench = fBenches->factory()(NULL);
             fBenches = fBenches->next();
             fSourceType = "bench";
             fBenchType  = "micro";
             return bench;
         }
 
         while (fGMs) {
             SkAutoTDelete<skiagm::GM> gm(fGMs->factory()(NULL));
             fGMs = fGMs->next();
-            if (gm->getFlags() & skiagm::GM::kAsBench_Flag) {
+            if (gm->runAsBench()) {
                 fSourceType = "gm";
                 fBenchType  = "micro";
                 return SkNEW_ARGS(GMBench, (gm.detach()));
             }
         }
 
         // First add all .skps as RecordingBenches.
         while (fCurrentRecording < fSKPs.count()) {
             const SkString& path = fSKPs[fCurrentRecording++];
             SkAutoTUnref<SkPicture> pic;
@@ skipping 274 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif