Use consistent globals in AttachCache.

Use consistent globals in AttachCache.

[bungeman, 2012-10-29 17:33:40]

In SkGlyphCache::AttachCache most of the code uses the globals from a
getGlobals() call, which is correct. There is currently one line which calls
SkGraphics::GetFontCacheLimit() which is returning values on the shared globals
which is a different object (and has a different lifetime). This was causing
crashes when using large numbers of threads. Use just the globals we already
have.

[Leon, 2012-10-29 17:42:35]

lgtm

[bungeman, 2012-10-31 15:00:37]

Committed revision 6188.