https://chromeenterprise.google/policies/pdf-viewer-out-of-process-iframe-enabled/
PdfViewerOutOfProcessIframeEnabled: Use out-of-process iframe PDF Viewer | Chrome Enterprise
Controls whether the PDF viewer in Google Chrome uses an out-of-process iframe (OOPIF). This will be the new PDF viewer architecture in the future, as it is...
out ofpdf vieweruseprocessiframe