Delay setting initial memory block until it officially exists.

BUG=323017
R=robertphillips@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/99833002

git-svn-id: http://skia.googlecode.com/svn/trunk/src@12446 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed