GM: create GmResultDigest that encapsulates digest type ("bitmap-64bitMD5") and value (12345)

R=scroggo@google.com

Review URL: https://codereview.chromium.org/15883004

git-svn-id: http://skia.googlecode.com/svn/trunk@9271 2bbb7eff-a529-9590-31e7-b0007b416f81
20 files changed