PDF: Fail fast if in the tree of resources a child references a parent. Ideally I want a crash when the tree of resources became corrupt, not later when we try to finalize the pdf.
Review URL: https://codereview.appspot.com/6740047

git-svn-id: http://skia.googlecode.com/svn/trunk@6006 2bbb7eff-a529-9590-31e7-b0007b416f81
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