Allow bench_pictures to have its viewport set on the command line.

Instead of drawing the entire (potentially very large) picture, only
draw one viewport's worth.

example:

bench_pictures <skp directory> --viewport 640 480

BUG=https://code.google.com/p/skia/issues/detail?id=1007

Review URL: https://codereview.appspot.com/6943052

git-svn-id: http://skia.googlecode.com/svn/trunk@6799 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed