Google seems set to stick it to iTunes in an attempt to carve out its own slice of the music market, hoping that by linking music sales up with its dominant search engine it will be able to achieve a content ecosystem designed to support sales of devices powered by its browser-based Android-one-day-Chrome OS. The company is thought to be closing in on launching a music download service, offering tracks for sale and download. This will be followed by the introduction of a subscription-based music service next year (2011), at least, that is what the Wall Street Journal claims. Negotiations aren’t…