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/XfermodeBench.cpp b/bench/XfermodeBench.cpp
index 41b00e6..1910b75 100644
--- a/bench/XfermodeBench.cpp
+++ b/bench/XfermodeBench.cpp
@@ -31,10 +31,10 @@
 protected:
     virtual const char* onGetName() SK_OVERRIDE { return fName.c_str(); }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         SkISize size = canvas->getDeviceSize();
         SkRandom random;
-        for (int i = 0; i < this->getLoops(); ++i) {
+        for (int i = 0; i < loops; ++i) {
             SkPaint paint;
             paint.setXfermode(fXfermode.get());
             paint.setColor(random.nextU());
@@ -70,8 +70,8 @@
 protected:
     virtual const char* onGetName() SK_OVERRIDE { return "xfermode_create"; }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        for (int outer = 0; outer < this->getLoops() * 10; ++outer) {
+    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+        for (int outer = 0; outer < loops * 10; ++outer) {
             for (int i = 0; i <= SkXfermode::kLastMode; ++i) {
                 SkXfermode* xfer = SkXfermode::Create(SkXfermode::Mode(i));
                 SkSafeUnref(xfer);