Convert smoothness to the new timeline based metric API.

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 1b9e80a9ab93c0d5fabf682c26070b2fc827c84a..8d189cdd0ebe44676781b36b385e20b3efcac254 100644
--- a/tools/telemetry/telemetry/page/page.py
+++ b/tools/telemetry/telemetry/page/page.py
@@ -6,6 +6,8 @@ import os
 import re
 import urlparse
 
+from telemetry import decorators
+
 
 class Page(object):
   def __init__(self, url, page_set, attributes=None, base_dir=None):
@@ -40,6 +42,17 @@ class Page(object):
     raise AttributeError(
         '%r object has no attribute %r' % (self.__class__, name))
 
+  @decorators.Cache
+  def GetSyntheticDelayCategories(self):
+    if not hasattr(self, 'synthetic_delays'):
+      return []
+    result = []
+    for delay, options in self.synthetic_delays.items():
+      options = '%f;%s' % (options.get('target_duration', 0),
+                           options.get('mode', 'static'))
+      result.append('DELAY(%s;%s)' % (delay, options))
+    return result
+
   def __lt__(self, other):
     return self.url < other.url