depot_tools: only add mock infra_paths when test data is enabled

BUG=chromium:605919

Review URL: https://codereview.chromium.org/1917093004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300193 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/infra_paths/api.py

@@ -29,9 +29,10 @@ class InfraPathsApi(recipe_api.RecipeApi):
     else:
       self.set_config('buildbot')
 
-    for path in self._test_data.get('exists', []):
-      assert isinstance(path.base, NamedBasePath)
-      self.m.path.mock_add_paths(self[path.base.name].join(*path.pieces))
+    if self._test_data.enabled:
+      for path in self._test_data.get('exists', []):
+        assert isinstance(path.base, NamedBasePath)
+        self.m.path.mock_add_paths(self[path.base.name].join(*path.pieces))
 
   def __getitem__(self, name):
     self._lazy_set_config()