Added SIMD stubs for dart2js

Added SIMD stubs for dart2js

BUG=10284
R=blois@google.com

Committed: https://code.google.com/p/dart/source/detail?r=22157

[blois, 2013-04-29 22:01:00]

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/html/dart2js/h...
File sdk/lib/html/dart2js/html_dart2js.dart (right):

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/html/dart2js/h...
sdk/lib/html/dart2js/html_dart2js.dart:29545: static final supportsSimd = false;
Can you add doc comments for this?

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/typed_data/dar...
File sdk/lib/typed_data/dart2js/typed_data_dart2js.dart (right):

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/typed_data/dar...
sdk/lib/typed_data/dart2js/typed_data_dart2js.dart:2361: abstract class
Float32x4 {
Is there no good way to share the declaration of these interfaces between
dartium and dart2js?

[vsm, 2013-04-29 23:55:39]

PTAL

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/html/dart2js/h...
File sdk/lib/html/dart2js/html_dart2js.dart (right):

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/html/dart2js/h...
sdk/lib/html/dart2js/html_dart2js.dart:29545: static final supportsSimd = false;
On 2013/04/29 22:01:01, blois wrote:
> Can you add doc comments for this?

Done.

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/typed_data/dar...
File sdk/lib/typed_data/dart2js/typed_data_dart2js.dart (right):

https://chromiumcodereview.appspot.com/14531008/diff/1/sdk/lib/typed_data/dar...
sdk/lib/typed_data/dart2js/typed_data_dart2js.dart:2361: abstract class
Float32x4 {
Not easily.  These classes are external / patched in the VM version, and I'd
have to factor and add layering just to throw an exception.

I've removed the instance methods (since they can never be invoked -
construction will fail).  This is consistent with what we were doing with
Uint64List above, and means we have less to keep in sync - but it might mean
dart2js warnings.

On 2013/04/29 22:01:01, blois wrote:
> Is there no good way to share the declaration of these interfaces between
> dartium and dart2js?

[blois, 2013-04-29 23:57:57]

lgtm

[vsm, 2013-04-30 00:03:47]

Committed patchset #2 manually as r22157 (presubmit successful).