Check for invalid SkPictures

- Remove hasRecorded() since nobody uses it.
- Add "success" boolean to SkPicture stream constructor
- Track failures in render_pictures and bench_pictures
Review URL: https://codereview.appspot.com/6493105

git-svn-id: http://skia.googlecode.com/svn/trunk@5573 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed