Simplify test file used by testBlinkPerfTracingMetricsForMeasureFrameTime & enable it on Android

tools/perf/benchmarks/blink_perf_unittest.py

Index: tools/perf/benchmarks/blink_perf_unittest.py
diff --git a/tools/perf/benchmarks/blink_perf_unittest.py b/tools/perf/benchmarks/blink_perf_unittest.py
index f756ee7820a4cedf44a77ad2661c52e90dd01b22..e4b12774cfa703f2847e8649b61b619cac74856a 100644
--- a/tools/perf/benchmarks/blink_perf_unittest.py
+++ b/tools/perf/benchmarks/blink_perf_unittest.py
@@ -4,7 +4,6 @@
 import os
 import unittest
 
-from telemetry import decorators
 from telemetry import story
 from telemetry.page import page as page_module
 from telemetry.testing import options_for_unittests
@@ -56,7 +55,6 @@ class BlinkPerfTest(page_test_test_case.PageTestTestCase):
     self.assertEquals(len(update_layout_trees), 1)
     self.assertGreater(update_layout_trees[0].GetRepresentativeNumber, 0.1)
 
-  @decorators.Disabled('android')  # crbug.com/715685
   def testBlinkPerfTracingMetricsForMeasureFrameTime(self):
     results = self.RunMeasurement(measurement=self._measurement,
         ps=self._CreateStorySetForTestFile(