Add m_pDocument in CPDF_Color and check if page date has been forced clear

This will prevent using freed pattern object.
This is a better solution than https://pdfium.googlesource.com/pdfium/+/1b9c5c4dc41956b8c5ab17b9a882adf8a2513768
and in essence revert that patch

BUG=409373
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/522483003