Reland of Track telemetry benchmark cycle time

telemetry/telemetry/internal/story_runner.py

Index: telemetry/telemetry/internal/story_runner.py
diff --git a/telemetry/telemetry/internal/story_runner.py b/telemetry/telemetry/internal/story_runner.py
index 375c26cf798a7f5d1841479b5d66aeebc2ee5b13..63e31b132533360a4dd71faf1c342b71d7163d1c 100644
--- a/telemetry/telemetry/internal/story_runner.py
+++ b/telemetry/telemetry/internal/story_runner.py
@@ -24,6 +24,7 @@ from telemetry import story as story_module
 from telemetry.util import wpr_modes
 from telemetry.value import failure
 from telemetry.value import skip
+from telemetry.value import scalar
 from telemetry.web_perf import story_test
 
 
@@ -301,6 +302,7 @@ def RunBenchmark(benchmark, finder_options):
     The number of failure values (up to 254) or 255 if there is an uncaught
     exception.
   """
+  start = time.time()
   benchmark.CustomizeBrowserOptions(finder_options.browser_options)
 
   benchmark_metadata = benchmark.GetMetadata()
@@ -375,6 +377,9 @@ def RunBenchmark(benchmark, finder_options):
         results.UploadTraceFilesToCloud(bucket)
         results.UploadProfilingFilesToCloud(bucket)
     finally:
+      duration = time.time() - start
+      results.AddSummaryValue(scalar.ScalarValue(
+          None, 'BenchmarkDuration', 'minutes', duration / 60.0))
       results.PrintSummary()
   return return_code