Make some additional classes hidden so that they are not generated when not

Make some additional classes hidden so that they are not generated when not
needed (fixes FF and Safari).
Committed: https://code.google.com/p/dart/source/detail?r=2505

[Jennifer Messerly, 2011-12-16 00:58:46]

another idea I had here was we could add a "maybe" annotation, so the code
generated was more like:
    if (Float32Array) Float32Array.prototype = ...

(but hidden seems like a faster way to get going)

[Siggi Cherem (dart-lang), 2011-12-16 01:50:21]

lgtm

[sra1, 2011-12-16 04:05:11]

http://codereview.chromium.org/8970013/diff/6001/client/dom/frog/dom_frog.dart
File client/dom/frog/dom_frog.dart (right):

http://codereview.chromium.org/8970013/diff/6001/client/dom/frog/dom_frog.dar...
client/dom/frog/dom_frog.dart:7697: class SVGPathSeg native "*SVGPathSeg" {
Where was SVGPathSeg a problem?
It is in the list we constructed by seeing what was defined in all supported
browsers.

[sra1, 2011-12-16 05:22:46]

On 2011/12/16 00:58:46, John Messerly wrote:
> another idea I had here was we could add a "maybe" annotation, so the code
> generated was more like:
>     if (Float32Array) Float32Array.prototype = ...

This won't work if e.g. Float32Array exists but can be constructed only via
calling a createFloat32Array method on some 'factory'.  Then you need hidden.

> 
> (but hidden seems like a faster way to get going)