Adding a new SkSurface factory for generating surfaces from the scratch texture pool.

TEST=Surface unit test
BUG=crbug.com/351798
R=bsalomon@google.com, robertphillips@google.com, reed@google.com

Author: junov@chromium.org

Review URL: https://codereview.chromium.org/201153023

git-svn-id: http://skia.googlecode.com/svn/trunk@13864 2bbb7eff-a529-9590-31e7-b0007b416f81
8 files changed