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/InterpBench.cpp b/bench/InterpBench.cpp
index 9cd99df..f6f70d4 100644
--- a/bench/InterpBench.cpp
+++ b/bench/InterpBench.cpp
@@ -35,8 +35,8 @@
         return fName.c_str();
     }
 
-    virtual void onDraw(SkCanvas*) {
-        int n = this->getLoops() * this->mulLoopCount();
+    virtual void onDraw(const int loops, SkCanvas*) {
+        int n = loops * this->mulLoopCount();
         for (int i = 0; i < n; i++) {
             this->performTest(fDst, fFx, fDx, kBuffer);
         }