Update to latest wptrunner.

tests/wpt/harness/wptrunner/executors/webdriver.py

@@ -220,12 +220,11 @@ class Transport(object):
         except Exception:
             # This should probably be more specific
             raise IOError
-        body = resp.read()
+        resp_body = resp.read()
 
         try:
-            data = json.loads(body)
+            data = json.loads(resp_body)
         except:
-            raise
             raise WebDriverException("Could not parse response body as JSON: %s" % body)
 
         if resp.status != 200:
@@ -345,6 +344,24 @@ class Find(object):
         return rv
 
 
+class Cookies(object):
+    def __init__(self, session):
+        self.session = session
+
+    def __getitem__(self, name):
+        self.session.send_command("GET", "cookie/%s" % name, {}, key="value")
+
+    def __setitem__(self, name, value):
+        cookie = {"name": name,
+                  "value": None}
+
+        if isinstance(name, (str, unicode)):
+            cookie["value"] = value
+        elif hasattr(value, "value"):
+            cookie["value"] = value.value
+        self.session.send_command("POST", "cookie/%s" % name, {}, key="value")
+
+
 class Session(object):
     def __init__(self, host, port, url_prefix="", desired_capabilities=None, port_timeout=60,
                  extension=None):
@@ -496,7 +513,7 @@ class Session(object):
             body["secure"] = secure
         if expiry is not None:
             body["expiry"] = expiry
-        self.send_command("POST", "cookie", body)
+        self.send_command("POST", "cookie", {"cookie": body})
 
     def delete_cookie(self, name=None):
         if name is None:
@@ -593,7 +610,7 @@ class Element(object):
         return self.session.send_command("GET", self.url("name"))
 
     @command
-    def css(self, property_name):
+    def style(self, property_name):
         return self.session.send_command("GET", self.url("css/%s" % property_name))
 
     @property
@@ -601,6 +618,10 @@ class Element(object):
     def rect(self):
         return self.session.send_command("GET", self.url("rect"))
 
+    @command
+    def attribute(self, name):
+        return self.session.send_command("GET", self.url("attribute/%s" % name))
+
 class ServoExtensions(object):
     def __init__(self, session):
         self.session = session