Add support for python pageset

tools/telemetry/telemetry/page/page.py

Index: tools/telemetry/telemetry/page/page.py
diff --git a/tools/telemetry/telemetry/page/page.py b/tools/telemetry/telemetry/page/page.py
index 337b11c8e279a97b921825dc3345a2e3843965ab..e51db38bde5d1f4495b3cd9830b94494aaadaf7a 100644
--- a/tools/telemetry/telemetry/page/page.py
+++ b/tools/telemetry/telemetry/page/page.py
@@ -6,9 +6,11 @@ import os
 import re
 import urlparse
 
+from telemetry.page.actions.navigate import NavigateAction
+
 
 class Page(object):
-  def __init__(self, url, page_set, attributes=None, base_dir=None):
+  def __init__(self, url, page_set=None, attributes=None, base_dir=None):
     self.url = url
     self.page_set = page_set
     self._base_dir = base_dir
@@ -26,6 +28,9 @@ class Page(object):
     if not self._scheme:
       raise ValueError('Must prepend the URL with scheme (e.g. file://)')
 
+  def RunNavigateSteps(self, action_runner):
+    action_runner.RunAction(NavigateAction())
+
   def __getattr__(self, name):
     # Inherit attributes from the page set.
     if self.page_set and hasattr(self.page_set, name):
@@ -45,6 +50,10 @@ class Page(object):
   def __str__(self):
     return self.url
 
+  def AddCustomizeBrowserOptions(self, options):
+    """ Inherit page overrides this to add customized browser options."""
+    pass
+
   @property
   def _scheme(self):
     return urlparse.urlparse(self.url).scheme