HELSINKI (Reuters) - Sony Ericsson unveiled its new X10 flagship phone on Tuesday, its first to run on Google's Android operating system, but plans to start to sell it only next year. Loss-making Sony Ericsson, the world's fourth largest handset maker, has suffered since 2008 from a lack of attractive high-end cellphone models in its offering, and saw overall sales shrinking 45 percent from a year ago in the last quarter.