[telemetry] Implement first version of timeline based measurement

tools/perf/metrics/timeline_based_metric_request_unittest.py

+# Copyright 2014 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 unittest
+
+from metrics import timeline_based_metric_request as tbmr_module
+
+
+class ParseTests(unittest.TestCase):
+  def testParse(self):
+    self.assertTrue(tbmr_module.IsTimelineMetricRequest(
+        "MetricRequest.Foo/Bar"))
+    self.assertFalse(tbmr_module.IsTimelineMetricRequest(
+        "SomethingRandom"))
+
+    self.assertEquals(
+        ('LogicalName', 'MetricType'),
+        tbmr_module.ParseTimelineMetricRequest(
+            "MetricRequest.LogicalName/MetricType"))
+
+    self.assertEquals(
+        ('LogicalNameWith/Slash', 'MetricType'),
+        tbmr_module.ParseTimelineMetricRequest(
+            "MetricRequest.LogicalNameWith/Slash/MetricType"))