Add benchmark for HandwritingInitiator

Benchmark results:
android.view.HandwritingInitiatorPerfTest#onTouchEvent_actionMove_toolTypeFinger: PASSED (8.111s)
  onTouchEvent_actionMove_toolTypeFinger_min (ns): 86
  onTouchEvent_actionMove_toolTypeFinger_mean (ns): 88
  onTouchEvent_actionMove_toolTypeFinger_median (ns): 88
  onTouchEvent_actionMove_toolTypeFinger_standardDeviation: 2

android.view.HandwritingInitiatorPerfTest#onTouchEvent_actionDown_toolTypeFinger: PASSED (8.701s)
  onTouchEvent_actionDown_toolTypeFinger_min (ns): 27
  onTouchEvent_actionDown_toolTypeFinger_mean (ns): 30
  onTouchEvent_actionDown_toolTypeFinger_median (ns): 30
  onTouchEvent_actionDown_toolTypeFinger_standardDeviation: 2

ndroid.view.HandwritingInitiatorPerfTest#onTouchEvent_actionUp_toolTypeFinger: PASSED (9.227s)
  onTouchEvent_actionUp_toolTypeFinger_min (ns): 50
  onTouchEvent_actionUp_toolTypeFinger_mean (ns): 50
  onTouchEvent_actionUp_toolTypeFinger_median (ns): 51
  onTouchEvent_actionUp_toolTypeFinger_standardDeviation: 0

android.view.HandwritingInitiatorPerfTest#onTouchEvent_actionMove_toolTypeStylus: PASSED (9.732s)
  onTouchEvent_actionMove_toolTypeStylus_min (ns): 129
  onTouchEvent_actionMove_toolTypeStylus_mean (ns): 131
  onTouchEvent_actionMove_toolTypeStylus_median (ns): 129
  onTouchEvent_actionMove_toolTypeStylus_standardDeviation: 2

android.view.HandwritingInitiatorPerfTest#onTouchEvent_actionDown_toolTypeStylus: PASSED (9.254s)
  onTouchEvent_actionDown_toolTypeStylus_min (ns): 97
  onTouchEvent_actionDown_toolTypeStylus_mean (ns): 99
  onTouchEvent_actionDown_toolTypeStylus_median (ns): 98
  onTouchEvent_actionDown_toolTypeStylus_standardDeviation: 3

android.view.HandwritingInitiatorPerfTest#onTouchEvent_actionUp_toolTypeStylus: PASSED (9.304s)
  onTouchEvent_actionUp_toolTypeStylus_min (ns): 62
  onTouchEvent_actionUp_toolTypeStylus_mean (ns): 64
  onTouchEvent_actionUp_toolTypeStylus_median (ns): 64
  onTouchEvent_actionUp_toolTypeStylus_standardDeviation: 1

android.view.HandwritingInitiatorPerfTest#updateEditorBoundary: PASSED (8.498s)
  updateEditorBoundary_min (ns): 6
  updateEditorBoundary_mean (ns): 6
  updateEditorBoundary_median (ns): 6
  updateEditorBoundary_standardDeviation: 0

android.view.HandwritingInitiatorPerfTest#onInputConnectionCreated: PASSED (8.926s)
  onInputConnectionCreated_min (ns): 60
  onInputConnectionCreated_mean (ns): 60
  onInputConnectionCreated_median (ns): 60
  onInputConnectionCreated_standardDeviation: 0

android.view.HandwritingInitiatorPerfTest#onInputConnectionClosed: PASSED (8.975s)
  onInputConnectionClosed_min (ns): 47
  onInputConnectionClosed_mean (ns): 49
  onInputConnectionClosed_median (ns): 49
  onInputConnectionClosed_standardDeviation: 1

Bug: 213216947
Test: atest CorePerfTests:android.view.HandwritingInitiatorPerfTest
Change-Id: I3a506572691cbb6ab78ae475823a2e3628ff9fae