Analyzer should support metadata annotation syntax

[gbracha]

Per issue #3214.

[bwilkerson]

Added Waiting label.

[bwilkerson]

Added Triaged label.

[bwilkerson]

Set owner to @bwilkerson.

[bwilkerson]

http://codereview.chromium.org/10860012/

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Added Fixed label.

[kasperl]

Can you guys verify that you allow metadata annotations in all the right places? Someone mentioned in passing that the implementation you have isn't complete (sorry that I do not have more details).

[bwilkerson]

Yes, unless the grammar has changed since we implemented this feature, we are accepting metadata in all of the places specified.

Until earlier this week our metadata support was incomplete in that we were not recording the parsed information in the element model and hence not using it to ensure correctness, but that has been fixed for the two kinds of metadata defined in the "meta" package: @­override and @­deprecated.

[gbracha]

I'm not sure about timelines, but metadata on type variables is one thing
that might have come in a tad later, so please check that.

[bwilkerson]

Confirmed that metadata on type variables was indeed added after we implemented the feature (unless we just missed it the first time around). It has now been added.