Bug 1328726 - (wdclient) Add element property command, use value key; r=ato

MozReview-Commit-ID: FZjSxRLV829

--HG--
extra : rebase_source : a32bf6b2ba21bd1d33b630988bfa756f9ee96748

testing/web-platform/tests/tools/webdriver/webdriver/client.py

@@ -524,22 +524,26 @@ class Element(object):
     @property
     @command
     def text(self):
-        return self.session.send_command("GET", self.url("text"))
+        return self.session.send_command("GET", self.url("text"), key="value")
 
     @property
     @command
     def name(self):
-        return self.session.send_command("GET", self.url("name"))
+        return self.session.send_command("GET", self.url("name"), key="value")
 
     @command
     def style(self, property_name):
-        return self.session.send_command("GET", self.url("css/%s" % property_name))
+        return self.session.send_command("GET", self.url("css/%s" % property_name), key="value")
 
     @property
     @command
     def rect(self):
         return self.session.send_command("GET", self.url("rect"))
 
+    @command
+    def property(self, name):
+        return self.session.send_command("GET", self.url("property/%s" % name), key="value")
+
     @command
     def attribute(self, name):
-        return self.session.send_command("GET", self.url("attribute/%s" % name))
+        return self.session.send_command("GET", self.url("attribute/%s" % name), key="value")