Comment #16 on issue 17569 by [email protected]: Crash in  
SkARGB32_Black_Blitter::blitMask
http://code.google.com/p/chromium/issues/detail?id=17569

This looks related, but since the other crash is in stack-allocated memory,  
the only
way this corruption could have caused the other crash is if it were  
occurring
simultaneously in a different thread.  It's unlikely that heap corruption  
at this
point could cause stack corruption in the other spot, since the clipRect  
was valid at
the time that MaskSuperBlitter::CanHandleRect() was called, so it would  
have to have
been corrupted CanHandleRect() was called.

As another data point, it looks as if this crash has been happening  
sporadically for
a long time (as far back as Chrome 1.0):

http://crash/search?query=blitMask

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