Support FormData on WorkerGlobalScope.

LayoutTests/fast/workers/resources/worker-formdata.js

Index: LayoutTests/fast/workers/resources/worker-formdata.js
diff --git a/LayoutTests/fast/workers/resources/worker-formdata.js b/LayoutTests/fast/workers/resources/worker-formdata.js
new file mode 100644
index 0000000000000000000000000000000000000000..27fa6f6e600d04837aaeb74cc06d479ba625d39e
--- /dev/null
+++ b/LayoutTests/fast/workers/resources/worker-formdata.js
@@ -0,0 +1,19 @@
+importScripts('../../../resources/js-test.js');
+
+description("Test FormData interface object");
+
+shouldBeDefined("FormData");
+shouldBe("FormData.length", "0");
+
+var formData = new FormData();
+
+shouldBeNonNull("formData");
+
+shouldBeTrue("'append' in formData");

[arv (Not doing code reviews), 2014/04/07 21:16:38]

I always prefer more specific tests than `in`. Can you do hasOwnProperty of
FormData.prototype instead?

[sof, 2014/04/08 19:36:50]

Noted; done.

+shouldNotThrow("formData.append('key', 'value');");
+var blob = new Blob([]);
+shouldBeNonNull("blob");
+shouldNotThrow("formData.append('key', blob);");
+shouldNotThrow("formData.append('key', blob, 'filename');");
+shouldThrow("postMessage(formData)");
+finishJSTest();