Telemetry: adds CPU frequency stats.

tools/perf/metrics/cpu_unittest.py

Index: tools/perf/metrics/cpu_unittest.py
diff --git a/tools/perf/metrics/cpu_unittest.py b/tools/perf/metrics/cpu_unittest.py
index 30d488dac8bc420399e00f32ea8a6fff6b8277d0..6f083794baf3fee515b66b04b66c6ef032081d75 100644
--- a/tools/perf/metrics/cpu_unittest.py
+++ b/tools/perf/metrics/cpu_unittest.py
@@ -31,3 +31,47 @@ class CpuMetricTest(unittest.TestCase):
     self.assertEqual({'Browser': 0.25, 'Renderer': 0.1},
                      cpu._SubtractCpuStats(end, start))
 
+    # The result for global frequency stats is used.
+    start = {
+      'Browser': {'CpuProcessTime': 0, 'TotalTime': 0},
+      'Global': {'GlobalCpuFrequencyStats': {1000000: 9, 2000000: 19}}
+    }
+    end = {
+      'Browser': {'CpuProcessTime': 5, 'TotalTime': 20},
+      'Global': {'GlobalCpuFrequencyStats': {1000000: 20, 2000000: 31}}
+    }
+
+    expected = {
+      'Browser': 0.25,
+      'Global': {'GlobalCpuFrequencyStats': {1000000: 11, 2000000: 12}}
+    }
+
+    self.assertEqual(expected, cpu._SubtractCpuStats(end, start))
+
+  def testAddResults(self):
+    results = {
+      'Browser': 0.25,
+      'Global': {'GlobalCpuFrequencyStats': {1000000: 11, 2000000: 12}}
+    }
+    class MockResults(object):
+      def __init__(self):
+        self.trace_name = None
+        self.units = None
+        self.value = None
+        self.chart_name = None
+        self.data_type = None
+
+      def Add(self, trace_name, units, value, chart_name=None,
+          data_type='default'):
+        self.trace_name = trace_name
+        self.units = units
+        self.value = value
+        self.chart_name = chart_name
+        self.data_type = data_type
+
+    mock_results = MockResults()
+    cpu_metric = cpu.CpuMetric(None)
+    cpu_metric._results = results
+    cpu_metric.AddResults(None, mock_results)
+    self.assertEquals(1521.74, mock_results.value)
+