telemetry: Replace mostly_smooth by percentage_smooth.

tools/perf/measurements/repaint_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.
 
 from measurements import repaint
 from telemetry.core import wpr_modes
 from telemetry.page import page as page_module
 from telemetry.unittest import options_for_unittests
 from telemetry.unittest import page_test_test_case
 from telemetry.unittest import test
@@ skipping 32 matching lines @@
     self.assertGreater(frame_times[0].GetRepresentativeNumber(), 0)
 
     mean_frame_time = results.FindAllPageSpecificValuesNamed('mean_frame_time')
     self.assertEquals(len(mean_frame_time), 1)
     self.assertGreater(mean_frame_time[0].GetRepresentativeNumber(), 0)
 
     jank = results.FindAllPageSpecificValuesNamed('jank')
     self.assertEquals(len(jank), 1)
     self.assertGreater(jank[0].GetRepresentativeNumber(), 0)
 
-    mostly_smooth = results.FindAllPageSpecificValuesNamed('mostly_smooth')
-    self.assertEquals(len(mostly_smooth), 1)
-    self.assertGreaterEqual(mostly_smooth[0].GetRepresentativeNumber(), 0)
+    percentage_smooth = results.FindAllPageSpecificValuesNamed(
+        'percentage_smooth')
+    self.assertEquals(len(percentage_smooth), 1)
+    self.assertGreaterEqual(percentage_smooth[0].GetRepresentativeNumber(), 0)
 
   @test.Disabled('android')
   def testCleanUpTrace(self):
     self.TestTracingCleanedUp(repaint.Repaint, self._options)