[Typed CSSOM] Add test for relative URLs with custom image properties

third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html

Index: third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html
diff --git a/third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html b/third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html
index a423ca47d4f047694bc02da04c1143e332f77efa..11bf78bc885635dd9a9775aaba90917711308bae 100644
--- a/third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html
+++ b/third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html
@@ -108,6 +108,24 @@ function t2Callback() {
   t2.done();
 }
 
+var t3 = async_test('Getting a relative URL image type registered property returns a CSSURLImageValue');
+function t3Callback() {
+  t3.step(function() {
+    testElement.style = '--my-image: url(\"resources/1x1-green.png\");';
+    assert_true(computedStyleMap.has('--my-image'));
+    var result = computedStyleMap.get('--my-image');
+    assert_true(result instanceof CSSURLImageValue);
+    assert_equals(result.cssText, 'url(\"' + imagePath + '\")');
+    // FIXME: This section of this test fails. It seems to be a bug in custom properties. See
+    // crbug.com/719838
+    assert_equals(result.state, 'loaded');
+    assert_equals(result.intrinsicWidth, 1);
+    assert_equals(result.intrinsicHeight, 1);
+    assert_equals(result.intrinsicRatio, 1);
+  });
+  t3.done();
+}
+
 test(function() {
   assert_true(childComputedStyleMap.has('--my-inherited-length'));
   var result = childComputedStyleMap.get('--my-inherited-length');
@@ -154,6 +172,7 @@ document.onreadystatechange = function() {
   if(document.readyState == 'complete') {
     t1Callback();
     t2Callback();
+    t3Callback();
   }
 };