W3C auto test import CL.

third_party/WebKit/LayoutTests/imported/wpt/annotation-protocol/files/annotations/anno10.json

+{
+  "@context": "http://www.w3.org/ns/anno.jsonld",
+  "id": "http://example.org/anno10",
+  "type": "Annotation",
+  "body": {
+    "type": "Choice",
+    "items": [
+      {
+        "id": "http://example.org/note1",
+        "language": "en"
+      },
+      {
+        "id": "http://example.org/note2",
+        "language": "fr"
+      }
+    ]
+  },
+  "target": "http://example.org/website1"
+}