Statically initialize those zero-size singletons.
This way GCC/Clang don't generate the magic static code to call the
pointless T::T() once in a threadsafe way. = {} is plenty initialized.
BUG=skia:2378
Committed: http://code.google.com/p/skia/source/detail?r=14623
R=bungeman@google.com, mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/270353003
git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@14626 2bbb7eff-a529-9590-31e7-b0007b416f81