Fix smooth_gesture_util to adjust the gesture record properly

tools/perf/measurements/smooth_gesture_util_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 time
 import unittest
 
+from measurements import smooth_gesture_util as sg_util
+from telemetry.core.platform import tracing_category_filter
+from telemetry.core.platform import tracing_options
+from telemetry.page import page as page_module
+from telemetry.page import page_test
+from telemetry.timeline import async_slice
 from telemetry.timeline import model as model_module
+from telemetry.unittest import page_test_test_case
 from telemetry.web_perf import timeline_interaction_record as tir_module
-from measurements import smooth_gesture_util as sg_util
+
 
 class SmoothGestureUtilTest(unittest.TestCase):
   def testGetAdjustedInteractionIfContainGesture(self):
     model = model_module.TimelineModel()
     renderer_main = model.GetOrCreateProcess(1).GetOrCreateThread(2)
     renderer_main.name = 'CrRendererMain'
 
     #      [          X          ]                   [   Y  ]
+    #      [  sub_async_slice_X  ]
     #          [   record_1]
     #          [   record_6]
     #  [  record_2 ]          [ record_3 ]
     #  [           record_4              ]
     #                                [ record_5 ]
-    renderer_main.BeginSlice('X', 'SyntheticGestureController::running', 10, 0)
-    renderer_main.EndSlice(30, 30)
-    renderer_main.BeginSlice('Y', 'SyntheticGestureController::running', 60, 0)
-    renderer_main.EndSlice(80, 80)
+    #
+    # Note: X and Y are async slice with name
+    # SyntheticGestureController::running
+
+    async_slice_X = async_slice.AsyncSlice(
+      'X', 'SyntheticGestureController::running', 10, duration=20,
+      start_thread=renderer_main, end_thread=renderer_main)
+
+    sub_async_slice_X = async_slice.AsyncSlice(
+      'X', 'SyntheticGestureController::running', 10, duration=20,
+      start_thread=renderer_main, end_thread=renderer_main)
+    sub_async_slice_X.parent_slice = async_slice_X
+    async_slice_X.AddSubSlice(sub_async_slice_X)
+
+    async_slice_Y = async_slice.AsyncSlice(
+      'X', 'SyntheticGestureController::running', 60, duration=20,
+      start_thread=renderer_main, end_thread=renderer_main)
+
+    renderer_main.AddAsyncSlice(async_slice_X)
+    renderer_main.AddAsyncSlice(async_slice_Y)
 
     model.FinalizeImport(shift_world_to_zero=False)
 
     record_1 = tir_module.TimelineInteractionRecord('Gesture_included', 15, 25)
     record_2 = tir_module.TimelineInteractionRecord(
       'Gesture_overlapped_left', 5, 25)
     record_3 = tir_module.TimelineInteractionRecord(
       'Gesture_overlapped_right', 25, 35)
     record_4 = tir_module.TimelineInteractionRecord(
       'Gesture_containing', 5, 35)
@@ skipping 27 matching lines @@
     self.assertEquals(adjusted_record_5.start, 35)
     self.assertEquals(adjusted_record_5.end, 45)
     self.assertTrue(adjusted_record_5 is not record_5)
 
     adjusted_record_6 = sg_util.GetAdjustedInteractionIfContainGesture(
       model, record_6)
     self.assertEquals(adjusted_record_6.start, 15)
     self.assertEquals(adjusted_record_6.end, 25)
     self.assertTrue(adjusted_record_6 is not record_6)
 
+
+class ScrollingPage(page_module.Page):
+  def __init__(self, url, page_set, base_dir):
+    super(ScrollingPage, self).__init__(url, page_set, base_dir)
+
+  def RunSmoothness(self, action_runner):
+    interaction = action_runner.BeginGestureInteraction(
+        'ScrollAction', is_smooth=True)
+    # Add 0.5s gap between when Gesture records are issued to when we actually
+    # scroll the page.
+    time.sleep(0.5)
+    action_runner.ScrollPage()
+    time.sleep(0.5)
+    interaction.End()
+
+
+class SmoothGestureTest(page_test_test_case.PageTestTestCase):
+  def testSmoothGestureAdjusted(self):
+    ps = self.CreateEmptyPageSet()
+    ps.AddPage(ScrollingPage(
+      'file://scrollable_page.html', ps, base_dir=ps.base_dir))
+    models = []
+    tab_ids = []
+    class ScrollingGestureTestMeasurement(page_test.PageTest):
+      def __init__(self):
+        super(ScrollingGestureTestMeasurement, self).__init__(
+          'RunSmoothness', False)
+
+      def WillRunActions(self, _page, tab):
+        options = tracing_options.TracingOptions()
+        options.enable_chrome_trace = True
+        tab.browser.platform.tracing_controller.Start(
+          options, tracing_category_filter.TracingCategoryFilter())
+
+      def DidRunActions(self, _page, tab):
+        models.append(model_module.TimelineModel(
+          tab.browser.platform.tracing_controller.Stop()))
+        tab_ids.append(tab.id)
+
+    self.RunMeasurement(ScrollingGestureTestMeasurement(), ps)
+    timeline_model = models[0]
+    renderer_thread = timeline_model.GetRendererThreadFromTabId(
+        tab_ids[0])
+    smooth_record = None
+    for e in renderer_thread.async_slices:
+      if tir_module.IsTimelineInteractionRecord(e.name):
+        smooth_record = tir_module.TimelineInteractionRecord.FromAsyncEvent(e)
+    self.assertIsNotNone(smooth_record)
+    adjusted_smooth_gesture = (
+      sg_util.GetAdjustedInteractionIfContainGesture(
+        timeline_model, smooth_record))
+    # Test that the scroll gesture starts at at least 500ms after the start of
+    # the interaction record and ends at at least 500ms before the end of
+    # interaction record.
+    self.assertLessEqual(
+      500, adjusted_smooth_gesture.start - smooth_record.start)
+    self.assertLessEqual(
+      500, smooth_record.end - adjusted_smooth_gesture.end)