Simplify benchmark internal API.

bench/ColorPrivBench.cpp

Index: bench/ColorPrivBench.cpp
diff --git a/bench/ColorPrivBench.cpp b/bench/ColorPrivBench.cpp
index 3143ef45256f321feeb5442cd03f4630840392d9..dd672ac807cdee6b5da98821cf6adb98f2ab8767 100644
--- a/bench/ColorPrivBench.cpp
+++ b/bench/ColorPrivBench.cpp
@@ -24,10 +24,10 @@ public:
 
     virtual const char* onGetName() SK_OVERRIDE { return fName.c_str(); }
 
-    virtual void onDraw(SkCanvas*) SK_OVERRIDE {
+    virtual void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
         const SkPMColor src = 0xAB998877, dst = 0x66334455;
         volatile SkPMColor junk = 0;
-        for (int i = 0; i < 10*this->getLoops(); ++i) {
+        for (int i = 0; i < 10*loops; ++i) {
             for (size_t j = 0; j <= SK_ARRAY_COUNT(fScales); j++) {
                 const unsigned scale = fScales[j];
                 if (kFast && kScale) {