Ensure SkPathRef debug code mutex is initialized during creation of statically-initialized SkPaths.

R=reed@google.com
Review URL: https://codereview.appspot.com/6592069

git-svn-id: http://skia.googlecode.com/svn/trunk@5797 2bbb7eff-a529-9590-31e7-b0007b416f81
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