Moving TVCM HTML files back to trace_viewer.

This CL moves the HTML files in the third_party/tvcm directory back into
trace viewer proper. I've changed the tvcm module to be called tv inside
the javascript and put the files in a base/ directory.
Merge pull request #632 from dj2/tvcm_to_base

Moving TVCM HTML files back to trace_viewer.

TBR=@natduca