[telemetry] Add Html2OutputFormatter for generating results2.html

telemetry/telemetry/value/scalar.py

Index: telemetry/telemetry/value/scalar.py
diff --git a/telemetry/telemetry/value/scalar.py b/telemetry/telemetry/value/scalar.py
index 2789b81319e9224333c4178683afc3b23dceebec..8dcd482f7fb0f6ee4758f854c91af4c2c452649c 100644
--- a/telemetry/telemetry/value/scalar.py
+++ b/telemetry/telemetry/value/scalar.py
@@ -78,7 +78,15 @@ class ScalarValue(summarizable.SummarizableValue):
   @staticmethod
   def FromDict(value_dict, page_dict):
     kwargs = value_module.Value.GetConstructorKwArgs(value_dict, page_dict)
-    kwargs['value'] = value_dict['value']
+
+    # Infinity and NaN are left out of JSON for security reasons that do not
+    # apply to our use cases, so TBMv2 serializes them as strings,
+    # but TBMv1 doesn't support them.
+    if value_dict['value'] in ['Infinity', '-Infinity', 'NaN']:
+      kwargs['value'] = None
+      kwargs['none_value_reason'] = 'value was ' + value_dict['value']
+    else:
+      kwargs['value'] = value_dict['value']
 
     if 'improvement_direction' in value_dict:
       kwargs['improvement_direction'] = value_dict['improvement_direction']