[Devtools] Added Product Registry module in prep for Network Grouping

This patch adds product registry module that will be in charge of a map
that contains which groups a url will fall under. It is pretty much just
a map of url -> groupName.

R=pfeldman
BUG=664704

Review-Url: https://codereview.chromium.org/2696183005
Cr-Commit-Position: refs/heads/master@{#450914}
6 files changed