Add checkerboard under the image.

BUG=skia:
R=mtklein@google.com

Author: jcgregorio@google.com

Review URL: https://codereview.chromium.org/263853004

git-svn-id: http://skia.googlecode.com/svn/trunk@14519 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/webtry/res/css/webtry.css b/experimental/webtry/res/css/webtry.css
index e2f241f..514fd77 100644
--- a/experimental/webtry/res/css/webtry.css
+++ b/experimental/webtry/res/css/webtry.css
@@ -4,8 +4,9 @@
   padding: 0;
 }
 
-img {
+#img {
   box-shadow: 2px 2px 5px gray;
+  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAAAAAA6mKC9AAAAAXNSR0IArs4c6QAAAAJiS0dEAP+Hj8y/AAAACXBIWXMAAA7DAAAOwwHHb6hkAAAAB3RJTUUH3gUBEi4DGRAQYgAAAB1JREFUGNNjfMoAAVJQmokBDdBHgPE/lPFsYN0BABdaAwN6tehMAAAAAElFTkSuQmCC");
 }
 
 .zoom {