Support longpress drag selection

ui/events/test/motion_event_test_utils.h

Index: ui/events/test/motion_event_test_utils.h
diff --git a/ui/events/test/motion_event_test_utils.h b/ui/events/test/motion_event_test_utils.h
index 139bf3d4dbb18cddc606683561dde83374a6de47..de8d6a21f83e0ed1b8cac91164d0d8f0c8d7fbca 100644
--- a/ui/events/test/motion_event_test_utils.h
+++ b/ui/events/test/motion_event_test_utils.h
@@ -44,14 +44,14 @@ struct MockMotionEvent : public MotionEventGeneric {
   ~MockMotionEvent() override;
 
   // Utility methods.
-  void PressPoint(float x, float y);
-  void MovePoint(size_t index, float x, float y);
-  void ReleasePoint();
-  void CancelPoint();
-  void SetTouchMajor(float new_touch_major);
-  void SetRawOffset(float raw_offset_x, float raw_offset_y);
-  void SetToolType(size_t index, ToolType tool_type);
-  void SetPrimaryPointerId(int id);
+  MockMotionEvent& PressPoint(float x, float y);
+  MockMotionEvent& MovePoint(size_t index, float x, float y);
+  MockMotionEvent& ReleasePoint();
+  MockMotionEvent& CancelPoint();
+  MockMotionEvent& SetTouchMajor(float new_touch_major);
+  MockMotionEvent& SetRawOffset(float raw_offset_x, float raw_offset_y);
+  MockMotionEvent& SetToolType(size_t index, ToolType tool_type);
+  MockMotionEvent& SetPrimaryPointerId(int id);
 
  private:
   void PushPointer(float x, float y);