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/TileBench.cpp b/bench/TileBench.cpp
index 4619d8b..9a9e27e 100644
--- a/bench/TileBench.cpp
+++ b/bench/TileBench.cpp
@@ -82,7 +82,7 @@
         return fName.c_str();
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(const int loops, SkCanvas* canvas) {
         SkPaint paint(fPaint);
         this->setupPaint(&paint);
         paint.setFilterLevel(fDoFilter ? SkPaint::kLow_FilterLevel
@@ -103,7 +103,7 @@
         SkPaint bgPaint;
         bgPaint.setColor(SK_ColorWHITE);
 
-        for (int i = 0; i < this->getLoops(); i++) {
+        for (int i = 0; i < loops; i++) {
             if (fDoTrans) {
                 canvas->drawRect(r, bgPaint);
             }