Add passthrough for query parameters that the stack uses but that don't appear in discovery.

apiclient/discovery.py

@@ -44,6 +44,7 @@ VARNAME = re.compile('[a-zA-Z0-9_-]+')
 DISCOVERY_URI = ('https://www.googleapis.com/discovery/v0.3/describe/'
   '{api}/{apiVersion}')
 DEFAULT_METHOD_DOC = 'A description of how to use this function'
+STACK_QUERY_PARAMETERS = ['trace']
 
 
 def key2param(key):
@@ -259,7 +260,7 @@ def createResource(http, baseUrl, model, requestBuilder,
 
     def method(self, **kwargs):
       for name in kwargs.iterkeys():
-        if name not in argmap:
+        if name not in argmap and name not in STACK_QUERY_PARAMETERS:
           raise TypeError('Got an unexpected keyword argument "%s"' % name)
 
       for name in required_params:

tests/test_discovery.py

@@ -103,6 +103,11 @@ class Discovery(unittest.TestCase):
     request = zoo.query(q="foo", i="1", n="1", b="", a=[1,2,3], o={'a':1}, e='bar')
     self._check_query_types(request)
 
+  def test_optional_stack_query_parameters(self):
+    self.http = HttpMock(datafile('zoo.json'), {'status': '200'})
+    zoo = build('zoo', 'v1', self.http)
+    request = zoo.query(trace='html')
+
   def test_buzz_resources(self):
     self.http = HttpMock(datafile('buzz.json'), {'status': '200'})
     buzz = build('buzz', 'v1', self.http)