Fix wrong task bounds when docking from recents.

When docking from recents we would move the task to the docked stack,
but we wouldn't run the resizing code that forces the task to be within
the stack bounds. We need to perform both operations and we can achieve
that using a more general method of moving tasks.

This also adds the passing of creation mode in the activity options, so
the task will be docked in the right spot.

Change-Id: Ia7f94a7e3677ed60ca2f4d889e548d80a3bc3df1