[Shades] Support using the light sensor to automatically disable Shades.

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What steps will reproduce the problem?
1. Use Shades in a dark room.
2. Go outside when it's bright.
3. Look at screen.

What is the expected output? What do you see instead?
Expected: Automatically notice that there's no rational reason to use Shades 
with so much light.
Instead: Always the loyal helper. Not very bright, though. (sorry, I couldn't 
resist the joke)

What version of the product are you using? On what operating system?
1.2.1

Additional thoughts:
Perhaps this should be controlled by a configuration checkbox, because there 
might be unforeseen cases/devices where the light sensor isn't all that useful 
for this. I was thinking that this would only trigger when you get beyond a 
certain threshold of clearly-very-bright.

Original issue reported on code.google.com by da...@google.com on 21 Oct 2012 at 12:20

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Original comment by alanv@google.com on 21 Nov 2012 at 1:39

• Changed state: Accepted

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Original comment by alanv@google.com on 21 Nov 2012 at 1:40