[binding] Check own property on named property accessor

LayoutTests/fast/dom/script-tests/collection-item-should-be-overridden-by-own-property.js

Index: LayoutTests/fast/dom/script-tests/collection-item-should-be-overridden-by-own-property.js
diff --git a/LayoutTests/fast/dom/script-tests/collection-item-should-be-overridden-by-own-property.js b/LayoutTests/fast/dom/script-tests/collection-item-should-be-overridden-by-own-property.js
new file mode 100644
index 0000000000000000000000000000000000000000..f9f8e62b0a6474ccad62892b179f418a3326ef6e
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+++ b/LayoutTests/fast/dom/script-tests/collection-item-should-be-overridden-by-own-property.js
@@ -0,0 +1,22 @@
+description("This test ensures the collection item obtained by named property getter is overridden by object's own property.");
+
+var form = document.all;
+var select = document.querySelector('select');
+var table = document.querySelector('table');
+shouldBe("document.all.foo", "document.getElementById('element0')");
+document.all.foo = 1;
+shouldBe("document.all.foo", "1");
+
+shouldBe("document.styleSheets.link1", "document.styleSheets[0]");
+document.styleSheets.link1 = 1;
+shouldBe("document.styleSheets.link1", "1");
+
+shouldBe("document.body.attributes.style", "document.body.attributes['style']");
+document.body.attributes.style = 1;
+shouldBe("document.body.attributes.style", "1");
+
+
+document.getElementById('testElements').style.display = 'none';
+
+var successfullyParsed = true;
+