Credential Manager: Add a 'formData' property to LocalCredential.

LayoutTests/http/tests/credentialmanager/localcredential-basics.html

Index: LayoutTests/http/tests/credentialmanager/localcredential-basics.html
diff --git a/LayoutTests/http/tests/credentialmanager/localcredential-basics.html b/LayoutTests/http/tests/credentialmanager/localcredential-basics.html
index 75912ec268fa67551e30587b62ddcf1b7f3769a5..f2cf25002be2d505f6fc0a56ef697d49bfe06778 100644
--- a/LayoutTests/http/tests/credentialmanager/localcredential-basics.html
+++ b/LayoutTests/http/tests/credentialmanager/localcredential-basics.html
@@ -14,6 +14,8 @@ test(function() {
         password: 'string'
     });
 
+    assert_true(credential.formData instanceof FormData);

[sof, 2014/10/20 08:35:46]

Can't you test this via the other typechecks in verifyInterface() instead?

[Mike West, 2014/10/20 09:47:38]

Sure. I was originally intending to check the values here, but as it turns out,
we don't expose FormData getters. Which is weird, but happily exactly what I
want anyway. :)

+
     assert_equals(credential.id, 'id');
     assert_equals(credential.name, 'name');
     assert_equals(credential.avatarURL, 'https://example.com/avatar.png');
@@ -29,6 +31,8 @@ test(function() {
 test(function() {
     var credential = new LocalCredential('id', 'pencil', 'name');
 
+    assert_true(credential.formData instanceof FormData);
+
     assert_equals(credential.id, 'id');
     assert_equals(credential.name, 'name');
     assert_equals(credential.avatarURL, '');
@@ -39,6 +43,8 @@ test(function() {
 test(function() {
     var credential = new LocalCredential('id', 'pencil');
 
+    assert_true(credential.formData instanceof FormData);
+
     assert_equals(credential.id, 'id');
     assert_equals(credential.name, '');
     assert_equals(credential.avatarURL, '');