Add some layout tests about behavior on undefined and null.

LayoutTests/fast/canvas/canvas-putImageData.js

 description("This test ensures that putImageData works correctly, the end result should be a 100x100px green square.");
 
 function fillRect(imageData, x, y, width, height, r, g, b, a)
 {
     var bytesPerRow = imageData.width * 4;
     var data =imageData.data;
     for (var i = 0; i < height; i++) {
         var rowOrigin = (y+i) * bytesPerRow;
         rowOrigin += x * 4;
         for (var j = 0; j < width; j++) {
@@ skipping 202 matching lines @@
 shouldThrow("context.putImageData(buffer, 0, 0, Infinity, 0, 0, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, 0, Infinity, 0, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, Infinity, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, Infinity)");
 shouldThrow("context.putImageData(buffer, undefined, 0, 0, 0, 0, 0)");
 shouldThrow("context.putImageData(buffer, 0, undefined, 0, 0, 0, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, undefined, 0, 0, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, 0, undefined, 0, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, undefined, 0)");
 shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, undefined)");
+shouldThrow("context.putImageData(null, 0, 0, 0, 0, 0, 0)");
+shouldThrow("context.putImageData(undefined, 0, 0, 0, 0, 0, 0)");
 
 // Ensure we don't mess up bounds clipping checks
 var rectcanvas = document.createElement("canvas");
 rectcanvas.width = 20;
 rectcanvas.height = 10;
 var rectbuffer = rectcanvas.getContext("2d");
 rectbuffer.putImageData(smallbuffer, 10, 0);
 
 var rectcanvas = document.createElement("canvas");
 rectcanvas.width = 10;
 rectcanvas.height = 20;
 var rectbuffer = rectcanvas.getContext("2d");
 rectbuffer.putImageData(smallbuffer, 0, 10);