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/RepeatTileBench.cpp b/bench/RepeatTileBench.cpp
index 348f906..ab7ccf4 100644
--- a/bench/RepeatTileBench.cpp
+++ b/bench/RepeatTileBench.cpp
@@ -89,7 +89,6 @@
     SkBitmap         fBitmap;
     bool             fIsOpaque;
     SkBitmap::Config fConfig;
-    enum { N = SkBENCHLOOP(20) };
 public:
     RepeatTileBench(void* param, SkBitmap::Config c, bool isOpaque = false) : INHERITED(param) {
         const int w = 50;
@@ -135,7 +134,7 @@
         SkPaint paint(fPaint);
         this->setupPaint(&paint);
 
-        for (int i = 0; i < N; i++) {
+        for (int i = 0; i < this->getLoops(); i++) {
             canvas->drawPaint(paint);
         }
     }