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/SkBenchmark.cpp b/bench/SkBenchmark.cpp
index 26a7a3b..39119b9 100644
--- a/bench/SkBenchmark.cpp
+++ b/bench/SkBenchmark.cpp
@@ -22,7 +22,6 @@
     fForceFilter = false;
     fDither = SkTriState::kDefault;
     fOrMask = fClearMask = 0;
-    fLoops = 1;
 }
 
 const char* SkBenchmark::getName() {
@@ -37,8 +36,8 @@
     this->onPreDraw();
 }
 
-void SkBenchmark::draw(SkCanvas* canvas) {
-    this->onDraw(canvas);
+void SkBenchmark::draw(const int loops, SkCanvas* canvas) {
+    this->onDraw(loops, canvas);
 }
 
 void SkBenchmark::postDraw() {