Add unit test for unbalanced save and restores in pictures.

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/150653010

git-svn-id: http://skia.googlecode.com/svn/trunk@13430 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed