Reduce iteration count on picture_playback benchmarks to bring their cost

more in line with the rest of the benches.

http://codereview.appspot.com/6325063/



git-svn-id: http://skia.googlecode.com/svn/trunk@4339 2bbb7eff-a529-9590-31e7-b0007b416f81

bench/PicturePlaybackBench.cpp

@@ -26,7 +26,7 @@ public:
     }
 
     enum {
-        N = SkBENCHLOOP(1000),   // number of times to playback the picture
+        N = SkBENCHLOOP(200),   // number of times to playback the picture
         PICTURE_WIDTH = 1000,
         PICTURE_HEIGHT = 4000,
         TEXT_SIZE = 10