Adds Chromecast hardware information to SystemProfileProto.

This information is already being collected and stored in UMA, but
has been kept internal. Updating public proto to match the internal
proto.

R=isherman@chromium.org,asvitkine@chromium.org,ghines@chromium.org
CC=lcwu@chromium.org
BUG=400925

Review URL: https://codereview.chromium.org/465133003

Cr-Commit-Position: refs/heads/master@{#290012}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290012 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed