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/RegionBench.cpp b/bench/RegionBench.cpp
index fb6e94f..ed58e3b 100644
--- a/bench/RegionBench.cpp
+++ b/bench/RegionBench.cpp
@@ -106,9 +106,9 @@
 protected:
     virtual const char* onGetName() { return fName.c_str(); }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(const int loops, SkCanvas* canvas) {
         Proc proc = fProc;
-        for (int i = 0; i < this->getLoops(); ++i) {
+        for (int i = 0; i < loops; ++i) {
             proc(fA, fB);
         }
     }