Task Execution Duration metrics added as a new benchmark

tools/telemetry/telemetry/value/summary.py

Index: tools/telemetry/telemetry/value/summary.py
diff --git a/tools/telemetry/telemetry/value/summary.py b/tools/telemetry/telemetry/value/summary.py
index 13e8ac20dfc52ba5b387fa9940d4d82099cbc6f5..d3a52930265931d4b1c6b24c424d1a9888562618 100644
--- a/tools/telemetry/telemetry/value/summary.py
+++ b/tools/telemetry/telemetry/value/summary.py
@@ -42,6 +42,8 @@ class Summary(object):
     self._computed_per_page_values = []
     self._computed_summary_values = []
     self._interleaved_computed_per_page_values_and_summaries = []
+    self._only_summary = any(isinstance(v, skip.SkipValue) and v.only_summaries
+        for v in all_page_specific_values)
     self._ComputePerPageValues(all_page_specific_values)
 
   @property
@@ -132,7 +134,7 @@ class Summary(object):
           num_successful_pages_for_value_name[value_name])
       for per_page_value in sorted_per_page_values:
         self._ComputePerPageValue(per_page_value,
-                                  num_successful_pages_for_this_value_name)
+          num_successful_pages_for_this_value_name)
 
       # Output the combined values.
       merged_pages_value = merged_pages_value_by_value_name.get(value_name,
@@ -147,7 +149,10 @@ class Summary(object):
     # If there were any page errors, we typically will print nothing.
     #
     # Note: this branch is structured less-densely to improve legibility.
-    if num_successful_pages_for_this_value_name > 1:
+
+    if self._only_summary:
+      should_print = False
+    elif num_successful_pages_for_this_value_name > 1:
       should_print = True
     elif (self.had_failures and
          num_successful_pages_for_this_value_name == 1):