If you followed the open video saga you know that the HTML5 spec video tag has a problem with the default codec to use. Apple wants h264, others do not want their proprietary codec and Microsoft could not care less. With this acquisition, Google could open source of one of their most performing codec and be head to head with h264.
Apple would have a hard time defending that H264 has enough superiority to be considered as the default HTML5 codec. Pretty sure Apple is not happy right now, of course that can’t stop them to put their head in the sand.