Make sure <url>s are being serialized according to spec

LayoutTests/fast/css/script-tests/image-set-setting.js

Index: LayoutTests/fast/css/script-tests/image-set-setting.js
diff --git a/LayoutTests/fast/css/script-tests/image-set-setting.js b/LayoutTests/fast/css/script-tests/image-set-setting.js
index 1488e25648559cc080e301dbd93909b16141463a..83b5ade5074c626fb4b95a9786d23e155cf2e754 100644
--- a/LayoutTests/fast/css/script-tests/image-set-setting.js
+++ b/LayoutTests/fast/css/script-tests/image-set-setting.js
@@ -16,28 +16,34 @@ function testImageSetRule(description, property, rule, expected)
     debug(description + " : " + rule);
 
     var fullRule = "-webkit-image-set(" + rule + ")";
-    shouldBeEqualToString('testComputedStyle("' + property + '", "' + fullRule + '")', fullRule);
+    var fullExpected = "-webkit-image-set(" + expected + ")";
+    shouldBeEqualToString('testComputedStyle("' + property + '", "' + fullRule + '")', fullExpected);
 }
 
 testImageSetRule("Single value for background-image",
                 "background-image",
-                "url(http://www.webkit.org/a) 1x");
+                "url(http://www.webkit.org/a) 1x",
+                "url(\"http://www.webkit.org/a\") 1x");
 
 testImageSetRule("Multiple values for background-image",
                 "background-image",
-                "url(http://www.webkit.org/a) 1x, url(http://www.webkit.org/b) 2x");
+                "url(http://www.webkit.org/a) 1x, url(http://www.webkit.org/b) 2x",
+                "url(\"http://www.webkit.org/a\") 1x, url(\"http://www.webkit.org/b\") 2x");
 
 testImageSetRule("Multiple values for background-image, out of order",
                 "background-image",
-                "url(http://www.webkit.org/c) 3x, url(http://www.webkit.org/b) 2x, url(http://www.webkit.org/a) 1x");
+                "url(http://www.webkit.org/c) 3x, url(http://www.webkit.org/b) 2x, url(http://www.webkit.org/a) 1x",
+                "url(\"http://www.webkit.org/c\") 3x, url(\"http://www.webkit.org/b\") 2x, url(\"http://www.webkit.org/a\") 1x");
 
 testImageSetRule("Duplicate values for background-image",
                 "background-image",
-                "url(http://www.webkit.org/c) 1x, url(http://www.webkit.org/b) 2x, url(http://www.webkit.org/a) 1x");
+                "url(http://www.webkit.org/c) 1x, url(http://www.webkit.org/b) 2x, url(http://www.webkit.org/a) 1x",
+                "url(\"http://www.webkit.org/c\") 1x, url(\"http://www.webkit.org/b\") 2x, url(\"http://www.webkit.org/a\") 1x");
 
 testImageSetRule("Fractional values for background-image",
                 "background-image",
-                "url(http://www.webkit.org/c) 0.2x, url(http://www.webkit.org/b) 2.3x, url(http://www.webkit.org/a) 12.3456x");
+                "url(http://www.webkit.org/c) 0.2x, url(http://www.webkit.org/b) 2.3x, url(http://www.webkit.org/a) 12.3456x",
+                "url(\"http://www.webkit.org/c\") 0.2x, url(\"http://www.webkit.org/b\") 2.3x, url(\"http://www.webkit.org/a\") 12.3456x");
 
 // FIXME: We should also be testing the behavior of negative values somewhere, but it's currently
 // broken.  http://wkb.ug/100132