Hookup role descriptions for webkit specific strings. Only doing this for ac...

Hookup role descriptions for webkit specific strings.  Only doing this for accessibility roles we know about.
BUG=none.
TEST=Use VoiceOver to confirm the proper role descriptions are read.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=57006

[feldstein, 2010-08-20 03:01:37]

http://codereview.chromium.org/3200001/diff/1/2
File chrome/browser/cocoa/browser_accessibility.mm (right):

http://codereview.chromium.org/3200001/diff/1/2#newcode187
chrome/browser/cocoa/browser_accessibility.mm:187: 
I can see us having to add a lot more of these special role descriptions, we
should probably have a [self roleDescription] method so that this method doesn't
get too large.

[David Tseng, 2010-08-20 16:09:41]

>
> http://codereview.chromium.org/3200001/diff/1/2
> File chrome/browser/cocoa/browser_accessibility.mm (right):
>
> http://codereview.chromium.org/3200001/diff/1/2#newcode187
> chrome/browser/cocoa/browser_accessibility.mm:187:
> I can see us having to add a lot more of these special role
> descriptions, we should probably have a [self roleDescription] method so
> that this method doesn't get too large.
>
> http://codereview.chromium.org/3200001/show
>
Ok, added a property for roleDescription.

Thanks.

[feldstein, 2010-08-20 18:20:47]

LGTM