Google and Verizon are nearing a deal that would make Google the default search engine on all Verizon mobile devices. The two companies would split advertising revenue from the new mobile search service. The tie-up is important for Verizon “because Google has 70 percent share of the search market on the PC,” said Laura Martin, an analyst with Soleil Securities Group. “Signing an ad revenue deal early would give Verizon an advantage over its competitors.”