Add support for "image-set"

third_party/WebKit/LayoutTests/fast/css/image-set-unprefixed.html

Index: third_party/WebKit/LayoutTests/fast/css/image-set-unprefixed.html
diff --git a/third_party/WebKit/LayoutTests/fast/css/image-set-unprefixed.html b/third_party/WebKit/LayoutTests/fast/css/image-set-unprefixed.html
new file mode 100644
index 0000000000000000000000000000000000000000..82c293f1be5535b462155ea98bf0fd14c78b53a3
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/fast/css/image-set-unprefixed.html
@@ -0,0 +1,100 @@
+<pre id="output"></pre>
+<script>
+function debug(msg)
+{
+    var output = document.getElementById("output");
+    output.appendChild(document.createTextNode(msg + "\n"));
+}
+
+function testComputedStyle(property, fullRule)
+{
+    var div = document.createElement("div");
+    document.body.appendChild(div);
+    div.setAttribute("style", property + ": " + fullRule);
+    var computedValue = div.style[property];
+    document.body.removeChild(div);
+    return computedValue;
+}
+
+function testImageSetRule(description, property, rule, expected)
+{
+    debug("");
+    debug(`${description} : ${rule}`);
+
+    var rule = `image-set(${rule})`;
+    if (testComputedStyle(property, rule) == rule)
+        debug("Unprefixed: PASS");
+    else
+        debug("Unprefixed: FAIL");
+
+    if (testComputedStyle(property, "-webkit-" + rule) == rule)
+        debug("Prefixed: PASS");
+    else
+        debug("Prefixed: FAIL");
+}
+
+if (window.testRunner)
+    window.testRunner.dumpAsText();
+
+testImageSetRule("Single value for background-image",
+                "background-image",
+                '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');
+
+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');
+
+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');
+
+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');
+
+testImageSetRule("Single value for list-style-image",
+                "list-style-image",
+                'url("http://www.webkit.org/a") 1x');
+
+testImageSetRule("Multiple values for list-style-image",
+                "list-style-image",
+                'url("http://www.webkit.org/a") 1x, url("http://www.webkit.org/b") 2x');
+
+testImageSetRule("Multiple values for list-style-image, out of order",
+                "list-style-image",
+                '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 list-style-image",
+                "list-style-image",
+                '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 list-style-image",
+                "list-style-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');
+
+testImageSetRule("Single value for content",
+                "content",
+                'url("http://www.webkit.org/a") 1x');
+
+testImageSetRule("Multiple values for content",
+                "content",
+                'url("http://www.webkit.org/a") 1x, url("http://www.webkit.org/b") 2x');
+
+testImageSetRule("Multiple values for content, out of order",
+                "content",
+                '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 content",
+                "content",
+                '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 content",
+                "content",
+                'url("http://www.webkit.org/c") 0.2x, url("http://www.webkit.org/b") 2.3x, url("http://www.webkit.org/a") 12.3456x');
+
+
+</script>