It's everything. That's why it's robotics. Now choose the part of the robot you want to work on. The intelligence algorithms? Control algorithms? The computer hardware? The computer high-level software? Low level software? (or perhaps you'd like to do in hardware what programmers do in software?)The rest of the electrical hardware? Take your pick!
Don't forget about mechanical engineering either...can't have any robots without them (and surely not flying ones).
I chose electrical because it sits between computer and mechanical (computing science was crossed off the list very early on for me since I knew I didn't want to spend all my time coding high level systems and certaintly wanted to learn some hardware as well). If you want to do a lot of intelligence stuff, CompSci is good. However, it often depends on how you approach the problem- electrical engineers can also do a lot of that stuff too but often approach it differently (doing things in hardware rather than software). I didn't choose computer engineering because it limits you too far with regards to things like electrical drives.
Like you can spend all day trying to code vision algorithms as a software engineering, or spend all day desigining hardware to do the same thing as a computer or electrical engineer.