Convert smoothness to the new timeline based metric API.

tools/perf/metrics/smoothness_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.
-
-import unittest
-
-from metrics import smoothness
-
-from telemetry.page import page
-
-
-class FakePlatform(object):
-  def IsRawDisplayFrameRateSupported(self):
-    return False
-
-
-class FakeBrowser(object):
-  def __init__(self):
-    self.platform = FakePlatform()
-    self.category_filter = None
-
-  def StartTracing(self, category_filter, _):
-    self.category_filter = category_filter
-
-
-class FakeTab(object):
-  def __init__(self):
-    self.browser = FakeBrowser()
-
-  def ExecuteJavaScript(self, js):
-    pass
-
-
-class SmoothnessMetricUnitTest(unittest.TestCase):
-  def testSyntheticDelayConfiguration(self):
-    attributes = {
-      'synthetic_delays': {
-        'cc.BeginMainFrame': { 'target_duration': 0.012 },
-        'cc.DrawAndSwap': { 'target_duration': 0.012, 'mode': 'alternating' },
-        'gpu.SwapBuffers': { 'target_duration': 0.012 }
-      }
-    }
-    test_page = page.Page('http://dummy', None, attributes=attributes)
-
-    tab = FakeTab()
-    smoothness_metric = smoothness.SmoothnessMetric()
-    smoothness_metric.Start(test_page, tab)
-
-    expected_category_filter = [
-        'DELAY(cc.BeginMainFrame;0.012000;static)',
-        'DELAY(cc.DrawAndSwap;0.012000;alternating)',
-        'DELAY(gpu.SwapBuffers;0.012000;static)',
-        'benchmark',
-        'webkit.console'
-    ]
-    self.assertEquals(expected_category_filter,
-                      sorted(tab.browser.category_filter.split(',')))