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/PicturePlaybackBench.cpp b/bench/PicturePlaybackBench.cpp
index bd84baf..7f8fe6f 100644
--- a/bench/PicturePlaybackBench.cpp
+++ b/bench/PicturePlaybackBench.cpp
@@ -26,7 +26,6 @@
     }
 
     enum {
-        N = SkBENCHLOOP(200),   // number of times to playback the picture
         PICTURE_WIDTH = 1000,
         PICTURE_HEIGHT = 4000,
         TEXT_SIZE = 10
@@ -44,16 +43,16 @@
         recordCanvas(pCanvas);
         picture.endRecording();
 
-        const SkPoint translateDelta = getTranslateDelta();
+        const SkPoint translateDelta = getTranslateDelta(this->getLoops());
 
-        for (int i = 0; i < N; i++) {
+        for (int i = 0; i < this->getLoops(); i++) {
             picture.draw(canvas);
             canvas->translate(translateDelta.fX, translateDelta.fY);
         }
     }
 
     virtual void recordCanvas(SkCanvas* canvas) = 0;
-    virtual SkPoint getTranslateDelta() {
+    virtual SkPoint getTranslateDelta(int N) {
         SkIPoint canvasSize = onGetSize();
         return SkPoint::Make(SkIntToScalar((PICTURE_WIDTH - canvasSize.fX)/N),
                              SkIntToScalar((PICTURE_HEIGHT- canvasSize.fY)/N));