Major bench refactoring.
   - Use FLAGS_.
   - Remove outer repeat loop.
   - Tune inner loop automatically.

BUG=skia:1590
R=epoger@google.com, scroggo@google.com

Review URL: https://codereview.chromium.org/23478013

git-svn-id: http://skia.googlecode.com/svn/trunk@11187 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/PerlinNoiseBench.cpp b/bench/PerlinNoiseBench.cpp
index d151825..605acf4 100644
--- a/bench/PerlinNoiseBench.cpp
+++ b/bench/PerlinNoiseBench.cpp
@@ -48,7 +48,10 @@
                                                  seed, stitchTiles ? &fSize : NULL);
         SkPaint paint;
         paint.setShader(shader)->unref();
-        this->drawClippedRect(canvas, x, y, paint);
+
+        for (int i = 0; i < this->getLoops(); i++) {
+            this->drawClippedRect(canvas, x, y, paint);
+        }
     }
 
     typedef SkBenchmark INHERITED;