Provide a constructor for (DOM)FormData, and rename to the more standard name,

Provide a constructor for (DOM)FormData, and rename to the more standard name,
FormData. Also add a constructor for FormElement.
Committed: https://code.google.com/p/dart/source/detail?r=11459

[Emily Fortuna, 2012-08-25 00:34:10]

Working on adding a test for this, but it's pretty complicated -- (our test
framework assumes a test is either run on the VM or is a browser test, but this
requires starting up a server on the VM and also running the browser). I or
Graham or someone is going to have to modify the test framework to do this. :-/

[sra1, 2012-08-25 01:37:21]

LGTM with a lame test.

We have some pretty lame tests - look at audioelement_test.
We should be able to test that at least it does not when constructed, that the
constructed value is actually a FormData, and the append method doesnt crash.

[Emily Fortuna, 2012-08-28 00:04:24]

PTAL -- Vijay. I ended up adding the FormElement constructor fix to this CL
because both tests use FormElement.

https://chromiumcodereview.appspot.com/10871070/diff/6001/tests/html/form_dat...
File tests/html/form_data_test.dart (right):

https://chromiumcodereview.appspot.com/10871070/diff/6001/tests/html/form_dat...
tests/html/form_data_test.dart:30: form.append('test', '1', 'foo');
What is this third argument "String filename" for? The regular FormData doesn't
seem to have this third argument.

[vsm, 2012-08-28 14:57:32]

lgtm