Simplify benchmark internal API.

bench/ImageDecodeBench.cpp

Index: bench/ImageDecodeBench.cpp
diff --git a/bench/ImageDecodeBench.cpp b/bench/ImageDecodeBench.cpp
index af0569fc6fcd669403f30c0fe3642f8b7a84e26c..a2ca0ecaec4b7f8946d75365d5b1735d5bb914b6 100644
--- a/bench/ImageDecodeBench.cpp
+++ b/bench/ImageDecodeBench.cpp
@@ -52,7 +52,7 @@ protected:
         }
     }
 
-    virtual void onDraw(SkCanvas*) SK_OVERRIDE {
+    virtual void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
 #ifdef SK_DEBUG
         if (!fValid) {
             SkDebugf("stream was invalid: %s\n", fName.c_str());
@@ -61,7 +61,7 @@ protected:
 #endif
         // Decode a bunch of times
         SkBitmap bm;
-        for (int i = 0; i < this->getLoops(); ++i) {
+        for (int i = 0; i < loops; ++i) {
             SkDEBUGCODE(bool success =) SkImageDecoder::DecodeStream(&fStream, &bm);
 #ifdef SK_DEBUG
             if (!success) {