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 9b83fdc7a02f57a9d6995c6b6a3f80cd0c2f6b73..4a32d2fbe4929946998935b0afc7ed808e60b53f 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);