[Telemetry] Add benchmark that doesn't launch chrome and collects platform data.

tools/perf/benchmarks/idle_platform.py

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from core import perf_benchmark
+
+from telemetry.timeline import chrome_trace_category_filter
+from telemetry.web_perf import timeline_based_measurement
+import page_sets
+
+
+class IdlePlatformBenchmark(perf_benchmark.PerfBenchmark):
+  """Idle platform benchmark.
+
+  This benchmark just starts up tracing agents and lets the platform sit idle.
+  """
+  def CreateTimelineBasedMeasurementOptions(self):
+    options = timeline_based_measurement.Options(
+        chrome_trace_category_filter.ChromeTraceCategoryFilter())
+    options.config.chrome_trace_config.category_filter.AddFilterString('rail')
+    options.config.enable_battor_trace = True
+    options.config.enable_cpu_trace = True
+    options.config.enable_chrome_trace = False
+    # Atrace tracing agent autodetects if its android and only runs if it is.
+    options.config.enable_atrace_trace = True
+    options.SetTimelineBasedMetrics([
+        'clockSyncLatencyMetric',
+        'powerMetric',
+        'tracingMetric'
+    ])
+    return options
+
+  def CreateStorySet(self, options):
+    return page_sets.IdlePlatformPageSet()
+
+  @classmethod
+  def ShouldTearDownStateAfterEachStoryRun(cls):
+    return True
+
+  @classmethod
+  def Name(cls):
+    return 'idle_platform'