Fixed bug with SkImage leaving canvas backing store in an immutable state after destroy.
Added unit test that verifies that surface backing is writable after creating and destroying an image.
Review URL: https://codereview.chromium.org/13226002

git-svn-id: http://skia.googlecode.com/svn/trunk@8512 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed