crank up innerloop to make hairlinebench more usable/reliable

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/1087583002
diff --git a/bench/HairlinePathBench.cpp b/bench/HairlinePathBench.cpp
index 67f5476..e421ce0 100644
--- a/bench/HairlinePathBench.cpp
+++ b/bench/HairlinePathBench.cpp
@@ -64,7 +64,9 @@
         }
 
         for (int i = 0; i < loops; i++) {
-            canvas->drawPath(path, paint);
+            for (int j = 0; j < 100; ++j) {
+                canvas->drawPath(path, paint);
+            }
         }
     }