If you don't believe Google should buy a few 30-second TV spots to hawk its Chrome browser, watch Google's VP of Search Products and User Experience try to explain Chrome to the semitechnical viewers at CNBC. The whole thing falls apart into a meandering talk about faster JavaScript rendering, overlaid with a chart of Google's waffling stock price — the real reason Mayer is on CNBC. I doubt investors changed their GOOG valuations based on Mayer's promise that in the future, crashing one tab in their browser won't take down the whole thing.