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/ImageDecodeBench.cpp b/bench/ImageDecodeBench.cpp
index af0569f..a2ca0ec 100644
--- a/bench/ImageDecodeBench.cpp
+++ b/bench/ImageDecodeBench.cpp
@@ -52,7 +52,7 @@
         }
     }
 
-    virtual void onDraw(SkCanvas*) SK_OVERRIDE {
+    virtual void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
 #ifdef SK_DEBUG
         if (!fValid) {
             SkDebugf("stream was invalid: %s\n", fName.c_str());
@@ -61,7 +61,7 @@
 #endif
         // Decode a bunch of times
         SkBitmap bm;
-        for (int i = 0; i < this->getLoops(); ++i) {
+        for (int i = 0; i < loops; ++i) {
             SkDEBUGCODE(bool success =) SkImageDecoder::DecodeStream(&fStream, &bm);
 #ifdef SK_DEBUG
             if (!success) {