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/TextBench.cpp b/bench/TextBench.cpp
index cc665b7..d32d0fd 100644
--- a/bench/TextBench.cpp
+++ b/bench/TextBench.cpp
@@ -91,7 +91,7 @@
         return fName.c_str();
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(const int loops, SkCanvas* canvas) {
         const SkIPoint dim = this->getSize();
         SkRandom rand;
 
@@ -111,7 +111,7 @@
             canvas->translate(SK_Scalar1, SK_Scalar1);
         }
 
-        for (int i = 0; i < this->getLoops(); i++) {
+        for (int i = 0; i < loops; i++) {
             if (fDoPos) {
                 canvas->drawPosText(fText.c_str(), fText.size(), fPos, paint);
             } else {