Import chrome idl into third_party

third_party/chrome/tools/test/additional_properties.json

Index: third_party/chrome/tools/test/additional_properties.json
diff --git a/third_party/chrome/tools/test/additional_properties.json b/third_party/chrome/tools/test/additional_properties.json
new file mode 100644
index 0000000000000000000000000000000000000000..0b800d94c2c705b0ad0c90a80fe87e750a5abfd4
--- /dev/null
+++ b/third_party/chrome/tools/test/additional_properties.json
@@ -0,0 +1,55 @@
+[
+  {
+    "namespace": "additionalProperties",
+    "types": [
+      {
+        "id": "AdditionalPropertiesType",
+        "type": "object",
+        "properties": {
+          "string": {
+            "type": "string",
+            "description": "Some string."
+          }
+        },
+        "additionalProperties": { "type": "any" }
+      }
+    ],
+    "functions": [
+      {
+        "name": "additionalProperties",
+        "type": "function",
+        "description": "Takes an object with additionalProperties",
+        "parameters": [
+          {
+            "name": "paramObject",
+            "type": "object",
+            "properties": {},
+            "additionalProperties": {"type": "any"}
+          }
+        ]
+      },
+      {
+        "name": "returnAdditionalProperties",
+        "type": "function",
+        "description": "Returns an object with additionalProperties.",
+        "nodoc": "true",
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "parameters": [
+              {
+                "name": "resultObject",
+                "type": "object",
+                "properties": {
+                  "integer": {"type": "integer"}
+                },
+                "additionalProperties": {"type": "string"}
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+]