Use mirrors and annotations to find test methods.

Use mirrors and annotations to find test methods.

It was too tiresome to type test method names three times, jumping back and forth
between test class and main earlier this morning. :-)

Also, we had a discussion about tests in the office.

R=brianwilkerson@google.com, danrubel@google.com, pquitslund@google.com
BUG=

Committed: https://code.google.com/p/dart/source/detail?r=35067

[Brian Wilkerson, 2014-04-08 04:44:25]

LGTM, but I'd like to hear the conversation and might want to modify this
afterward. (I'm not sure, for example, that we want two mechanisms for
identifying a test method. Also, I like being able to have failing tests.)

[scheglov, 2014-04-08 04:54:54]

On 2014/04/08 04:44:25, Brian Wilkerson wrote:
> LGTM, but I'd like to hear the conversation and might want to modify this
> afterward. (I'm not sure, for example, that we want two mechanisms for
> identifying a test method. Also, I like being able to have failing tests.)

Yes, this is just a straw man proposal.
If we'll decide to use fine, modify it - even better :-)

I don't have a strong opinion about which mechanism to use.
@runTest is slightly clearer than "test" prefix, but it doesn't look like an
ideal opposite name for @failingTest.
And @successfulTest is too long.

[scheglov, 2014-04-15 16:34:23]

Committed patchset #1 manually as r35067 (presubmit successful).