Try to re-land portion of FailureValue patch (399263003) that should

tools/telemetry/telemetry/results/gtest_test_results.py

Index: tools/telemetry/telemetry/results/gtest_test_results.py
diff --git a/tools/telemetry/telemetry/results/gtest_test_results.py b/tools/telemetry/telemetry/results/gtest_test_results.py
index 3153556ef67399d4b0afdf52dbbf9188d531d1ea..55b2a1e85e0c3c12e3fcef526c7f073cee00a044 100644
--- a/tools/telemetry/telemetry/results/gtest_test_results.py
+++ b/tools/telemetry/telemetry/results/gtest_test_results.py
@@ -22,7 +22,7 @@ class GTestTestResults(page_test_results.PageTestResults):
         '(%0.f ms)' % self._GetMs())
     self._output_stream.flush()
 
-  def ValidateValue(self, value):
+  def AddValue(self, value):
     # TODO(chrishenry): When FailureValue is added, this should instead
     # validate that isinstance(value, FailureValue) is true.
     raise Exception('GTestTestResults does not support AddValue().')