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/DeferredSurfaceCopyBench.cpp b/bench/DeferredSurfaceCopyBench.cpp
index cbf96d0..7c9abea 100644
--- a/bench/DeferredSurfaceCopyBench.cpp
+++ b/bench/DeferredSurfaceCopyBench.cpp
@@ -17,7 +17,6 @@
 
 class DeferredSurfaceCopyBench : public SkBenchmark {
     enum {
-        N = SkBENCHLOOP(5),
         kSurfaceWidth = 1000,
         kSurfaceHeight = 1000,
     };
@@ -56,7 +55,7 @@
         SkAutoTUnref<SkDeferredCanvas> drawingCanvas(SkDeferredCanvas::Create(surface));
         surface->unref();
 
-        for (int iteration = 0; iteration < N; iteration++) {
+        for (int iteration = 0; iteration < this->getLoops(); iteration++) {
             drawingCanvas->clear(0);
             SkAutoTUnref<SkImage> image(drawingCanvas->newImageSnapshot());
             SkPaint paint;