Add IDs to Telemetry Pages.

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 5ebce2242f86fdac2f45a319dfcf2f6c3e617e56..33101a70ce6e996f115d058948effce4ac5dd859 100644
--- a/tools/telemetry/telemetry/page/page.py
+++ b/tools/telemetry/telemetry/page/page.py
@@ -7,8 +7,10 @@ import os
 import re
 import urlparse
 
+_next_page_id = 0
 
 class Page(object):
+
   def __init__(self, url, page_set=None, base_dir=None, name=''):
     self._url = url
     self._page_set = page_set
@@ -19,6 +21,10 @@ class Page(object):
     self._base_dir = base_dir
     self._name = name
 
+    global _next_page_id
+    self._id = _next_page_id
+    _next_page_id += 1
+
     # These attributes can be set dynamically by the page.
     self.synthetic_delays = dict()
     self.startup_url = page_set.startup_url if page_set else ''
@@ -63,6 +69,10 @@ class Page(object):
   def url(self):
     return self._url
 
+  @property
+  def id(self):
+    return self._id
+
   def GetSyntheticDelayCategories(self):
     result = []
     for delay, options in self.synthetic_delays.items():