Add new Telemetry tests to get CPU and memory usage for idle and flinging two test scenarios. Mirro…

chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py

Index: chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
diff --git a/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py b/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
new file mode 100644
index 0000000000000000000000000000000000000000..f0461cca1646b5b2f881855ef85833a665fbddaa
--- /dev/null
+++ b/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
@@ -0,0 +1,48 @@
+# 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.
+
+import logging
+import json
+
+from telemetry.core import exceptions
+from telemetry.value import scalar
+
+from metrics import Metric
+
+
+UNITS = {'privateMemory': 'MB',
+         'cpu': ''}

[mark a. foltz, 2016/04/13 20:20:03]

Can you define units for CPU?  Is it a utilization percentage or fraction?

[Lei Lei, 2016/04/14 01:55:12]

It is a utilization percentage, I renamed the metric name to cpu_utilization and
added '%' as units.

+
+
+class MediaRouterCPUMemoryMetric(Metric):
+  "A metric for media router CPU/Memory usage."
+
+  def Start(self, page, tab):
+    raise NotImplementedError()
+
+  def Stop(self, page, tab):
+    raise NotImplementedError()
+
+  def AddResults(self, tab, results):
+    results_json = None
+    try:
+      results_json = tab.EvaluateJavaScript(
+          'JSON.stringify(window.perfResults)')
+    except exceptions.EvaluateException:
+      pass
+    # This log gives the detailed information about CPU/memory usage.
+    logging.info('results_json' + ': ' + str(results_json))
+
+    if results_json:

[mark a. foltz, 2016/04/13 20:20:03]

Slight preference for early return, to reduce indentation.

if not results_json:
  return

[Lei Lei, 2016/04/14 01:55:12]

Done.

+      perf_results = json.loads(results_json)
+      for (metric, metric_results) in perf_results.iteritems():
+        units = UNITS.get(metric)

[mark a. foltz, 2016/04/13 20:20:03]

This can be put into L47.

[Lei Lei, 2016/04/14 01:55:13]

Done.

+        for (process, process_results) in metric_results.iteritems():
+          if len(process_results) > 0:

[mark a. foltz, 2016/04/13 20:20:03]

if not process_results:
  continue

[Lei Lei, 2016/04/14 01:55:13]

Done.

+            avg_result = round(sum(process_results)/len(process_results), 4)
+            if metric == 'privateMemory':
+              avg_result = round(avg_result/(1024 * 1024), 2)
+            results.AddValue(scalar.ScalarValue(
+                results.current_page, '%s_%s' % (process, metric), units,
+                avg_result))