Add -logPerIter, -timers, and -min to bench_pictures.

Additional changes:

Add instance count to bench_pictures.

Remove various PictureBenchmark subclasses which did not do
anything besides have a different PictureRenderer.

BUG=https://code.google.com/p/skia/issues/detail?id=856

Review URL: https://codereview.appspot.com/6496109

git-svn-id: http://skia.googlecode.com/svn/trunk@5496 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed