Ensure original parser context is used when parsing resolved var() references

third_party/WebKit/LayoutTests/fast/css/resources/image-url-var.css

Index: third_party/WebKit/LayoutTests/fast/css/resources/image-url-var.css
diff --git a/third_party/WebKit/LayoutTests/fast/css/resources/image-url-var.css b/third_party/WebKit/LayoutTests/fast/css/resources/image-url-var.css
new file mode 100644
index 0000000000000000000000000000000000000000..af5c69d4dc8779b1d48bab82ce5657f612abe056
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/fast/css/resources/image-url-var.css
@@ -0,0 +1,31 @@
+.background.image-set.var {
+  --test: url('test.png');
+  background: -webkit-image-set(var(--test) 1x);
+}
+.background.image-set.inline {
+  background: -webkit-image-set(url('test.png') 1x);
+}
+
+.background.url.var {
+  --test: url('test.png');
+  background: var(--test);
+}
+.background.url.inline {
+  background: url('test.png');
+}
+
+.background-image.image-set.var {
+  --test: url('test.png');
+  background-image: -webkit-image-set(var(--test) 1x);
+}
+.background-image.image-set.inline {
+  background-image: -webkit-image-set(url('test.png') 1x);
+}
+
+.background-image.url.var {
+  --test: url('test.png');
+  background-image: var(--test);
+}
+.background-image.url.inline {
+  background-image: url('test.png');
+}