The contextId argument for HTMLCanvasElement getContext() api should not be optional

LayoutTests/fast/dom/script-tests/non-numeric-values-numeric-parameters.js

 description(
 'This tests the behavior of non-numeric values in contexts where the DOM has a numeric parameter.'
 );
 
 function nonNumericPolicy(template)
 {
     var x = 0;
     try {
         eval(template);
     } catch (e) {
@@ skipping 154 matching lines @@
 }
 
 function createHTMLTableRowElement()
 {
     var table = document.createElement("table");
     var row = table.insertRow(0);
     row.insertCell(0);
     return row;
 }
 
+function createCanvasElement()
+{
+    return document.createElement("canvas");
+}
+
 // CharacterData
 
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").substringData(x, 0)')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").substringData(0, x)')", "'any type allowed (but not omitted)'");
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").insertData(x, \"b\")')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").deleteData(x, 0)')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").deleteData(0, x)')", "'any type allowed (but not omitted)'");
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").replaceData(x, 0, \"b\")')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.createTextNode(\"a\").replaceData(0, x, \"b\")')", "'any type allowed'");
 
@@ skipping 63 matching lines @@
 // HTMLTableSectionElement
 
 shouldBe("nonNumericPolicy('createHTMLTableSectionElement().insertRow(x)')", "'any type allowed'");
 shouldBe("nonNumericPolicy('createHTMLTableSectionElement().deleteRow(x)')", "'any type allowed (but not omitted)'");
 
 // HTMLInputElement
 
 shouldBe("nonNumericPolicy('document.createElement(\"textarea\").setSelectionRange(x, 0)')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.createElement(\"textarea\").setSelectionRange(0, x)')", "'any type allowed'");
 
+// HTMLCanvasElement
+
+shouldBe("nonNumericPolicy('createCanvasElement().getContext(x)')", "'any type allowed (but not omitted)'");
+
 // KeyboardEvent
 
 shouldBe("nonNumericPolicy('document.createEvent(\"KeyboardEvent\").initKeyboardEvent(\"a\", false, false, null, \"b\", x, false, false, false, false, false)')", "'any type allowed'");
 
 // MediaList
 
 shouldBe("nonNumericPolicy('createMediaList().item(x)')", "'any type allowed (but not omitted)'");
 
 // MouseEvent
 
@@ skipping 354 matching lines @@
 ../../../../WebCore/svg/SVGSVGElement.idl:                 attribute float currentScale
 
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double a;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double b;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double c;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double d;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double e;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double f;
 
 */