Dropout implies stochastic descent?
It depends a bit on your definition, usually the stochastic part of Stochastic Gradient Descent refers to the fact that you sample mini batches and estimate the true gradient with this sample. Dropout adds stochastic behaviour by sampling masks that comes down to sampling new network architectures every time. You could certainly see this as a form of stochastic gradient descent but whether this is the case or not depends solely on the definition.