SkOnce in is_lcd_supported instead of hand rolled double-checked locking.

BUG=skia:
R=bungeman@google.com, reed@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/155963003

git-svn-id: http://skia.googlecode.com/svn/trunk@13387 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed