Major bench refactoring.

bench/ReadPixBench.cpp

Index: bench/ReadPixBench.cpp
diff --git a/bench/ReadPixBench.cpp b/bench/ReadPixBench.cpp
index 66db2eb93507ee25778e261bf03af9602ef0f480..505ff32269485386332dcac3bd0913e8ca5235e2 100644
--- a/bench/ReadPixBench.cpp
+++ b/bench/ReadPixBench.cpp
@@ -45,9 +45,11 @@ protected:
 
         bitmap.setConfig(SkBitmap::kARGB_8888_Config, kWindowSize, kWindowSize);
 
-        for (int x = 0; x < kNumStepsX; ++x) {
-            for (int y = 0; y < kNumStepsY; ++y) {
-                canvas->readPixels(&bitmap, x * offX, y * offY);
+        for (int i = 0; i < this->getLoops(); i++) {
+            for (int x = 0; x < kNumStepsX; ++x) {
+                for (int y = 0; y < kNumStepsY; ++y) {
+                    canvas->readPixels(&bitmap, x * offX, y * offY);
+                }
             }
         }
     }