Doc: pdf illustration

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Review URL: https://codereview.chromium.org/1807963002

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 PDF Objects and Document Structure
 ----------------------------------
 
+![PDF Logical Document Structure](PdfLogicalDocumentStructure.png)
+
 **Background**: The PDF file format has a header, a set of objects and
 then a footer that contains a table of contents for all of the objects
 in the document (the cross-reference table). The table of contents