Introduce TracingController and TracingControllerBackend skeleton

tools/telemetry/telemetry/core/platform/tracing_category_filter_unittest.py

Index: tools/telemetry/telemetry/core/platform/tracing_category_filter_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/tracing_category_filter_unittest.py b/tools/telemetry/telemetry/core/platform/tracing_category_filter_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..8a287d2e271a51f666e365b7a5959bbe00496889
--- /dev/null
+++ b/tools/telemetry/telemetry/core/platform/tracing_category_filter_unittest.py
@@ -0,0 +1,22 @@
+# 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 telemetry.core.platform import tracing_category_filter
+
+
+class TracingCategoryFilterTests(unittest.TestCase):
+  def testBasic(self):
+    f = tracing_category_filter.TracingCategoryFilter(
+        'x,-y,disabled-by-default-z,DELAY(7;foo)')
+    self.assertEquals(['x'], f.included_categories)
+    self.assertEquals(['y'], f.excluded_categories)
+    self.assertEquals(['disabled-by-default-z'],
+        f.disabled_by_default_categories)
+    self.assertEquals(['DELAY(7;foo)'], f.delays)
+
+    self.assertEquals(
+        'x,disabled-by-default-z,-y,DELAY(7;foo)',
+        f.filter_string)