Add support for references in different paths in apis

tools/json_schema_compiler/model_test.py

Index: tools/json_schema_compiler/model_test.py
diff --git a/tools/json_schema_compiler/model_test.py b/tools/json_schema_compiler/model_test.py
index 75ed9c5817f0b208395970deea47d3405782fcc0..2f5a89004da405f968f081a69926220d55c99312 100755
--- a/tools/json_schema_compiler/model_test.py
+++ b/tools/json_schema_compiler/model_test.py
@@ -14,32 +14,32 @@ class ModelTest(unittest.TestCase):
     self.model = model.Model()
     self.permissions_json = CachedLoad('test/permissions.json')
     self.model.AddNamespace(self.permissions_json[0],
-        'path/to/permissions.json')
+        'path/to/permissions.json', '')
     self.permissions = self.model.namespaces.get('permissions')
     self.windows_json = CachedLoad('test/windows.json')
     self.model.AddNamespace(self.windows_json[0],
-        'path/to/window.json')
+        'path/to/window.json', '')
     self.windows = self.model.namespaces.get('windows')
     self.tabs_json = CachedLoad('test/tabs.json')
     self.model.AddNamespace(self.tabs_json[0],
-        'path/to/tabs.json')
+        'path/to/tabs.json', '')
     self.tabs = self.model.namespaces.get('tabs')
     self.idl_chromeos = Load('test/idl_namespace_chromeos.idl')
     self.model.AddNamespace(self.idl_chromeos[0],
-        'path/to/idl_namespace_chromeos.idl')
+        'path/to/idl_namespace_chromeos.idl', '')
     self.idl_namespace_chromeos = self.model.namespaces.get(
         'idl_namespace_chromeos')
     self.idl_all_platforms = Load('test/idl_namespace_all_platforms.idl')
     self.model.AddNamespace(self.idl_all_platforms[0],
-        'path/to/idl_namespace_all_platforms.idl')
+        'path/to/idl_namespace_all_platforms.idl', '')
     self.idl_namespace_all_platforms = self.model.namespaces.get(
         'idl_namespace_all_platforms')
     self.idl_non_specific_platforms = Load(
         'test/idl_namespace_non_specific_platforms.idl')
     self.model.AddNamespace(self.idl_non_specific_platforms[0],
-        'path/to/idl_namespace_non_specific_platforms.idl')
+        'path/to/idl_namespace_non_specific_platforms.idl', '')
     self.idl_namespace_non_specific_platforms = self.model.namespaces.get(
-        'idl_namespace_non_specific_platforms')
+        'idl_namespace_non_specific_platforms', '')
 
   def testNamespaces(self):
     self.assertEquals(6, len(self.model.namespaces))
@@ -89,7 +89,7 @@ class ModelTest(unittest.TestCase):
     (self.permissions_json[0]['types'][0]
         ['properties']['permissions']['type']) = 'something'
     self.assertRaises(model.ParseException, self.model.AddNamespace,
-        self.permissions_json[0], 'path/to/something.json')
+        self.permissions_json[0], 'path/to/something.json', '')
 
   def testDescription(self):
     self.assertFalse(