I tried to "auto prefix" the log message because, redefining a debugging helper used by b2g, I feared it might be confusing if a b2g dev try to search the logged message on mxr.mozilla.org
and doesn't find it because its one of our logs.

For almost the same reason I used the same prefix ( "-*-" ) used in the original helper.

I'm not sure how important this could be (I find useful that additional information during
debugging/prototyping but probably it's too much info to leave there normally)

@mykmelez let me know if we prefer to remove (or even comment only the "auto prefix" part)