Support total and per-second task/threadtime timeline metrics

tools/perf/benchmarks/thread_times.py

Index: tools/perf/benchmarks/thread_times.py
diff --git a/tools/perf/benchmarks/thread_times.py b/tools/perf/benchmarks/thread_times.py
index 9d7400f8d2d4b1d9d59960d900d9303cb9b7cf7c..0261bd7f84c895ef49525acab3f3afa1cff55eb1 100644
--- a/tools/perf/benchmarks/thread_times.py
+++ b/tools/perf/benchmarks/thread_times.py
@@ -18,6 +18,11 @@ class _ThreadTimes(benchmark.Benchmark):
   def Name(cls):
     return 'thread_times'
 
+  @classmethod
+  def ValueCanBeAddedPredicate(cls, value, _):
+    # Default to only reporting per-frame metrics.
+    return 'per_ms' not in value.name
+
   def CreatePageTest(self, options):
     return thread_times.ThreadTimes(options.report_silk_details)