I know, let's throw money at it! ;)
Imagine if they had taken the same amount of cash, hired a bunch of motivated CS people to do an after-school program with Raspberry Pi. Topics like "build a robot that draws" etc.
It's not clear to me that an after-school program with Raspberry Pi, or other CS-based funding, will lead to educational improvements. You premise is similar to One Laptop Per Child, which hasn't been successful despite a lot of money and motivated CS effort being thrown at it.
One obvious question is to ask is if a $3000/year raise, for 10 years, for all of the teachers in the district, would give better educational outcomes.
For all I know, paying for a full-time school nurse might give better outcomes. (Checking now, http://achieve.lausd.net/Page/3709 says nurses in LA schools get about $55K/year, so that's 21 years of salary funding for a nurse per school, so 10 years if I include overhead. There's also the need for a room and supplies, but then again there already are some school nurses.)