Simplify benchmark internal API.

I'm not quite sure why I wrote such a convoluted API with setLoops()/getLoops().
This replaces it with a loops argument passed to onDraw().

This CL is largely mechanical translation from the old API to the new one.
MathBench used this->getLoops() outside onDraw(), which seems incorrect.  I
fixed it.

BUG=
R=djsollen@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/99893003

git-svn-id: http://skia.googlecode.com/svn/trunk@12466 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/WritePixelsBench.cpp b/bench/WritePixelsBench.cpp
index 949b5bc..0313846 100644
--- a/bench/WritePixelsBench.cpp
+++ b/bench/WritePixelsBench.cpp
@@ -46,7 +46,7 @@
         return fName.c_str();
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         SkISize size = canvas->getDeviceSize();
 
         canvas->clear(0xFFFF0000);
@@ -55,7 +55,7 @@
         bmp.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
         canvas->readPixels(&bmp, 0, 0);
 
-        for (int loop = 0; loop < this->getLoops(); ++loop) {
+        for (int loop = 0; loop < loops; ++loop) {
             canvas->writePixels(bmp, 0, 0, fConfig);
         }
     }