Simplify benchmark internal API.

bench/MergeBench.cpp

Index: bench/MergeBench.cpp
diff --git a/bench/MergeBench.cpp b/bench/MergeBench.cpp
index 51be22f2845e87f48294fa9144407b1d765631a0..1723cbfc2191643d8e50ac5dc7713a500beab63c 100644
--- a/bench/MergeBench.cpp
+++ b/bench/MergeBench.cpp
@@ -32,12 +32,12 @@ protected:
         }
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         SkRect r = fIsSmall ? SkRect::MakeWH(FILTER_WIDTH_SMALL, FILTER_HEIGHT_SMALL) :
                               SkRect::MakeWH(FILTER_WIDTH_LARGE, FILTER_HEIGHT_LARGE);
         SkPaint paint;
         paint.setImageFilter(mergeBitmaps())->unref();
-        for (int i = 0; i < this->getLoops(); i++) {
+        for (int i = 0; i < loops; i++) {
             canvas->drawRect(r, paint);
         }
     }