Simplify benchmark internal API.

bench/StrokeBench.cpp

Index: bench/StrokeBench.cpp
diff --git a/bench/StrokeBench.cpp b/bench/StrokeBench.cpp
index 769c09ad72c4329fb1f2677cd334b1a0cb33a3c7..975c01f7b6ac9e503a8278f46531f4219246aac1 100644
--- a/bench/StrokeBench.cpp
+++ b/bench/StrokeBench.cpp
@@ -78,13 +78,13 @@ protected:
         return fName.c_str();
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(const int loops, SkCanvas* canvas) {
         fRec.fCanvas = canvas;
         this->setupPaint(&fRec.fPaint);
         fRec.fPaint.setStyle(SkPaint::kStroke_Style);
         fRec.fPaint.setStrokeJoin(fJoin);
         fRec.fPaint.setStrokeWidth(5);
-        fProc(&fRec, this->getLoops());
+        fProc(&fRec, loops);
     }
 
 private: