Update WATCHLIST entries for pdr.

This patch changes the pdr@google SVG entry to pdr@chromium, and adds
pdr to the rendering watchlist.

NOTRY=true
TBR=eseidel

Review URL: https://codereview.chromium.org/138833011

git-svn-id: svn://svn.chromium.org/blink/trunk@166790 bbb929c8-8fbe-4397-9dbb-9b2b20218538