|The header files in this directory are the only ones that should ever be
|included by an embedder of PDFium. If there arises a need for functionality
|beyond what is present here, then a new API must be added here to provide it.
|These header files must be entirely contained in this directory; they must
|never include other header files from outside of it.
|These files must compile cleanly without warnings on both C and C++ compilers.
|Changes to these files must be carefully considered to avoid breaking