Move DeferredDisplayState out of ops

bug:9969358

Instead of storing DeferredDisplayState within an op (thus forcing ops
to be tied to a single state instance), associate each op with a new
state at DeferredDisplayList insertion time.

Now, DisplayLists (and the ops within) can be reused in a single
DeferredDisplayList draw call, as ops will use different state
instances at different points in the frame.

Change-Id: I525ab2abe0c3883679f2fa00b219b293e9ec53d9