Bug 1299062 - Add crashtest. r=nical

--HG--
extra : rebase_source : 12d12c4b5adf0acac1762f769d41dd7f6b4f5495

dom/canvas/crashtests/1299062-1.html

@@ -0,0 +1,5 @@
+<canvas id='id0' width='35376.4661501'></canvas>
+<script>
+var ctx=document.getElementById('id0').getContext('2d');
+ctx.getImageData(66,-1,32,87);
+</script>

dom/canvas/crashtests/crashtests.list

@@ -36,4 +36,5 @@ load 1288872-1.html
 load 1290628-1.html
 load 1283113-1.html
 load 1286458-1.html
+load 1299062-1.html