This was initially waived off by the referee, but after they conferred and went to the review, it was pretty clearly a goal. The puck crossed the line and there's no way that Brayden Schenn forcefully pushed Jonathan Quick and the puck across the blueline. That was merely Quick's momentum that carried them over the line. GOOD GOAL.
In the immediate aftermath after the no goal call, Drew Doughty got a little taunty with Schenn near the net. (You may remember Doughty from earlier in the evening when he got schooled twice by Jakub Voracek.)
And after the call was reversed, it's safe to say Jonathan Quick disagreed:
Full recap of tonight's win here. WOOOOOOO.