Add support for new canvas ellipse method.

LayoutTests/fast/canvas/script-tests/canvas-ellipse-360-winding.js

Index: LayoutTests/fast/canvas/script-tests/canvas-ellipse-360-winding.js
diff --git a/LayoutTests/fast/canvas/script-tests/canvas-arc-360-winding.js b/LayoutTests/fast/canvas/script-tests/canvas-ellipse-360-winding.js
similarity index 64%
copy from LayoutTests/fast/canvas/script-tests/canvas-arc-360-winding.js
copy to LayoutTests/fast/canvas/script-tests/canvas-ellipse-360-winding.js
index 0ec7b823ab99d3fa10b181e82349164dc85bf64b..aefe3423c04298e7f1c7e3686bb2c20b6e3d3171 100644
--- a/LayoutTests/fast/canvas/script-tests/canvas-arc-360-winding.js
+++ b/LayoutTests/fast/canvas/script-tests/canvas-ellipse-360-winding.js
@@ -11,7 +11,7 @@ var anticlockwise = true;
 ctx.beginPath();
 for (r = 200; r >= 10; r -= 10) {
     ctx.moveTo(150 + r, 75);
-    ctx.arc(150, 75, r, 0, Math.PI*2, anticlockwise);
+    ctx.ellipse(150, 75, r, r * 1.2, 0, 0, Math.PI * 2, anticlockwise);
     ctx.closePath();
     anticlockwise = !anticlockwise;
 }
@@ -22,18 +22,24 @@ ctx.stroke();
 
 var imageData = ctx.getImageData(297, 75, 1, 1);
 var data = imageData.data;
-shouldBe("data[0]", "0");
 shouldBe("data[1]", "0");
-shouldBe("data[2]", "0");
 
-imageData = ctx.getImageData(285, 5, 1, 1);
+imageData = ctx.getImageData(295, 144, 1, 1);
 data = imageData.data;
-shouldBe("data[0]", "0");
 shouldBe("data[1]", "255");
-shouldBe("data[2]", "0");
 
-imageData = ctx.getImageData(277, 75, 1, 1);
+imageData = ctx.getImageData(272, 144, 1, 1);
+data = imageData.data;
+shouldBe("data[1]", "255");
+
+imageData = ctx.getImageData(262, 144, 1, 1);
 data = imageData.data;
-shouldBe("data[0]", "0");
 shouldBe("data[1]", "0");
-shouldBe("data[2]", "0");
+
+imageData = ctx.getImageData(239, 144, 1, 1);
+data = imageData.data;
+shouldBe("data[1]", "0");
+
+imageData = ctx.getImageData(228, 144, 1, 1);
+data = imageData.data;
+shouldBe("data[1]", "255");