Major bench refactoring.
   - Use FLAGS_.
   - Remove outer repeat loop.
   - Tune inner loop automatically.

BUG=skia:1590
R=epoger@google.com, scroggo@google.com

Review URL: https://codereview.chromium.org/23478013

git-svn-id: http://skia.googlecode.com/svn/trunk@11187 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/RectoriBench.cpp b/bench/RectoriBench.cpp
index bb88797..0a0b71d 100644
--- a/bench/RectoriBench.cpp
+++ b/bench/RectoriBench.cpp
@@ -27,7 +27,7 @@
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkRandom Random;
 
-        for (int i = 0; i < N; i++) {
+        for (int i = 0; i < this->getLoops(); i++) {
             SkScalar blurSigma = Random.nextRangeScalar(1.5f, 25.0f);
             SkScalar size = Random.nextRangeScalar(20*blurSigma, 50*blurSigma);
 
@@ -70,8 +70,6 @@
         H = 480,
     };
 
-    enum { N = SkBENCHLOOP(100) };
-
     SkLayerDrawLooper* createLooper(SkScalar xOff, SkScalar sigma) {
         SkLayerDrawLooper* looper = new SkLayerDrawLooper;