Add wider support to json_schema_compiler

tools/json_schema_compiler/test/crossref.json

Index: tools/json_schema_compiler/test/crossref.json
diff --git a/tools/json_schema_compiler/test/crossref.json b/tools/json_schema_compiler/test/crossref.json
index 8a74059476d4256866cc1a7976d70ed6e1815be3..02e5c94ab706e358ee4fd053faf7e5d53681e5d8 100644
--- a/tools/json_schema_compiler/test/crossref.json
+++ b/tools/json_schema_compiler/test/crossref.json
@@ -2,10 +2,21 @@
   {
     "namespace": "crossref",
     "dependencies": ["simple_api"],
-    "types": [],
+    "types": [
+      {
+        "id": "CrossrefType",
+        "type": "object",
+        "properties": {
+          "testType": {
+            "$ref": "TestType",
+            "optional": true
+          }
+        }
+      }
+    ],
     "functions": [
       {
-        "name": "TestTypeOptionalParam",
+        "name": "testTypeOptionalParam",
         "type": "function",
         "description": "Takes TestType as a param.",
         "parameters": [
@@ -38,6 +49,26 @@
             ]
           }
         ]
+      },
+      {
+        "name": "testTypeInObject",
+        "type": "function",
+        "description": "Takes an optional object with a TestType and a bool.",
+        "parameters": [
+          {
+            "name": "paramObject",
+            "type": "object",
+            "properties": {
+              "testType": {"$ref": "TestType", "optional": true},
+              "boolean": {"type": "boolean"}
+            }
+          },
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": []
+          }
+        ]
       }
     ]
   }