Add support for python pageset

tools/telemetry/telemetry/page/actions/page_action.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import telemetry.core.timeline.bounds as timeline_bounds
 
 class PageActionNotSupported(Exception):
   pass
 
 class PageActionFailed(Exception):
   pass
 
 class PageActionInvalidTimelineMarker(Exception):
   pass
 
 class PageAction(object):
   """Represents an action that a user might try to perform to a page."""
   _next_timeline_marker_id = 0
 
   def __init__(self, attributes=None):
     if attributes:
-      for k, v in attributes.iteritems():
-        setattr(self, k, v)
+      self.SetAttributes(attributes)
     self._timeline_marker_base_name = None
     self._timeline_marker_id = None
 
+  def SetAttributes(self, attributes):
+    for k, v in attributes.iteritems():
+      setattr(self, k, v)
+
   def CustomizeBrowserOptionsForPageSet(self, options):
     """Override to add action-specific options to the BrowserOptions
     object. These options will be set for the whole page set.
 
     If the browser is not being restarted for every page in the page set then
     all browser options required for the action must be set here. This, however,
     requires that they do not conflict with options require by other actions
     used up by the page set.
     """
     pass
@@ skipping 66 matching lines @@
 
   def GetActiveRangeOnTimeline(self, timeline):
     active_range = timeline_bounds.Bounds()
 
     if self._GetUniqueTimelineMarkerName():
       active_range.AddEvent(
           timeline.GetEventOfName(self._GetUniqueTimelineMarkerName(),
                                   True, True))
 
     return active_range