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/ImageCacheBench.cpp b/bench/ImageCacheBench.cpp
index 3a22a47..c0a2d3d 100644
--- a/bench/ImageCacheBench.cpp
+++ b/bench/ImageCacheBench.cpp
@@ -13,7 +13,6 @@
     SkBitmap            fBM;
 
     enum {
-        N = SkBENCHLOOP(1000),
         DIM = 1,
         CACHE_COUNT = 500
     };
@@ -46,7 +45,7 @@
 
         SkBitmap tmp;
         // search for a miss (-1 scale)
-        for (int i = 0; i < N; ++i) {
+        for (int i = 0; i < this->getLoops(); ++i) {
             (void)fCache.findAndLock(fBM, -1, -1, &tmp);
         }
     }