Add traffic setting as a grouping key

telemetry/telemetry/page/__init__.py

Index: telemetry/telemetry/page/__init__.py
diff --git a/telemetry/telemetry/page/__init__.py b/telemetry/telemetry/page/__init__.py
index 880a076f36264a6996c7e160f40f9bceb96fd1af..2d587fc6991c7d3c014bb83a5e20fdc1716f6bcd 100644
--- a/telemetry/telemetry/page/__init__.py
+++ b/telemetry/telemetry/page/__init__.py
@@ -50,6 +50,8 @@ class Page(story.Story):
     self._cache_temperature = cache_temperature
     if cache_temperature != cache_temperature_module.ANY:
       self.grouping_keys['cache_temperature'] = cache_temperature
+    if traffic_setting != traffic_setting_module.NONE:
+      self.grouping_keys['traffic_setting'] = traffic_setting
 
     assert traffic_setting in traffic_setting_module.NETWORK_CONFIGS, (
         'Invalid traffic setting: %s' % traffic_setting)