Insert PDF Material UI flag

Adding both --enable-out-of-process-pdf and --enable-pdf-material-ui will allow the user to view index-material.html (containing the new Polymer UI).

BUG=110020

Review URL: https://codereview.chromium.org/821763003

Cr-Commit-Position: refs/heads/master@{#310002}
9 files changed