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/FontCacheBench.cpp b/bench/FontCacheBench.cpp
index c6aab7a..c206d5b 100644
--- a/bench/FontCacheBench.cpp
+++ b/bench/FontCacheBench.cpp
@@ -24,10 +24,6 @@
 }
 
 class FontCacheBench : public SkBenchmark {
-    enum {
-        N = SkBENCHLOOP(50)
-    };
-
 public:
     FontCacheBench(void* param) : INHERITED(param) {}
 
@@ -44,7 +40,7 @@
         const uint16_t* array = gUniqueGlyphIDs;
         while (*array != gUniqueGlyphIDs_Sentinel) {
             size_t count = count_glyphs(array);
-            for (int i = 0; i < N; ++i) {
+            for (int i = 0; i < this->getLoops(); ++i) {
                 paint.measureText(array, count * sizeof(uint16_t));
             }
             array += count + 1;    // skip the sentinel