Add FailureValue and wire it through PageTestResults.

tools/telemetry/telemetry/value/failure_unittest.py

Index: tools/telemetry/telemetry/value/failure_unittest.py
diff --git a/tools/telemetry/telemetry/value/failure_unittest.py b/tools/telemetry/telemetry/value/failure_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..799e047f691517c7f944ea34f8067fd8cf65b41f
--- /dev/null
+++ b/tools/telemetry/telemetry/value/failure_unittest.py
@@ -0,0 +1,44 @@
+# 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 os
+import sys
+import unittest
+
+from telemetry import value
+from telemetry.page import page_set
+from telemetry.value import failure
+
+class TestBase(unittest.TestCase):
+  def setUp(self):
+    self.page_set = page_set.PageSet(file_path=os.path.dirname(__file__))
+    self.page_set.AddPageWithDefaultRunNavigate("http://www.bar.com/")
+
+  @property
+  def pages(self):
+    return self.page_set.pages
+
+class ValueTest(TestBase):
+  def testName(self):
+    v0 = failure.FailureValue.FromMessage(self.pages[0], 'Failure')
+    self.assertEqual('Exception', v0.name)
+    try:
+      raise NotImplementedError()
+    except Exception:
+      v1 = failure.FailureValue(self.pages[0], sys.exc_info())
+    self.assertEqual('NotImplementedError', v1.name)
+
+  def testBuildbotAndRepresentativeValue(self):
+    v = failure.FailureValue.FromMessage(self.pages[0], 'Failure')
+    self.assertIsNone(v.GetBuildbotValue())
+    self.assertIsNone(v.GetBuildbotDataType(
+        value.COMPUTED_PER_PAGE_SUMMARY_OUTPUT_CONTEXT))
+    self.assertIsNone(v.GetBuildbotMeasurementAndTraceNameForPerPageResult())
+    self.assertIsNone(v.GetRepresentativeNumber())
+    self.assertIsNone(v.GetRepresentativeString())
+
+  def testAsDict(self):
+    v = failure.FailureValue.FromMessage(self.pages[0], 'Failure')
+    d = v.AsDictWithoutBaseClassEntries()
+    self.assertTrue(d['value'].find('Exception: Failure') > -1)