Make getComputedStyle throw for incorrect first parameter

LayoutTests/fast/css/getComputedStyle/computed-style-non-element-parameter.html

Index: LayoutTests/fast/css/getComputedStyle/computed-style-non-element-parameter.html
diff --git a/LayoutTests/fast/css/getComputedStyle/computed-style-non-element-parameter.html b/LayoutTests/fast/css/getComputedStyle/computed-style-non-element-parameter.html
new file mode 100644
index 0000000000000000000000000000000000000000..480ebdccc67808545c79f8612a929d48520bbdd1
--- /dev/null
+++ b/LayoutTests/fast/css/getComputedStyle/computed-style-non-element-parameter.html
@@ -0,0 +1,22 @@
+<div id="result"></div>
+<script>
+    if (window.testRunner)

[tkent, 2014/11/25 22:59:28]

Indent the whole content of <script> is not helpful.

+        testRunner.dumpAsText();
+
+    var noException = true;
+    try {
+        getComputedStyle(null);
+        noException = false;

[tkent, 2014/11/25 22:59:28]

Please import ../../../resources/js-test.js, and use
shouldNotThrow('getComputedStyle(null)').

+    } catch(e) {};
+    try {
+        getComputedStyle(undefined);
+        noException = false;
+    } catch(e) {};
+    var txtNode = document.createTextNode("foo");
+    try {
+        getComputedStyle(txtNode);
+        noException = false;
+    } catch(e) {};
+
+    document.getElementById("result").innerText = noException ? "PASS" : "FAIL"
+</script>