TextControl NG: Do not add scrollbars to text fields

This CL ports LayoutTextControlSingleLine::AllowsNonVisibleOverflow()
to LayoutNGTextControlSingleLine.

This CL has no behavior changes now, but it fixes
baseline-alignment-and-overflow.tentative.html in WPT with
LayoutNGTextField flag.

Bug: 1040826
Change-Id: If21b1b150922229a180293dd9f8c1cceb43ab70a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2501169
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821135}

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_single_line.cc

@@ -79,4 +79,10 @@ bool LayoutNGTextControlSingleLine::NodeAtPoint(
   return true;
 }
 
+bool LayoutNGTextControlSingleLine::AllowsNonVisibleOverflow() const {
+  NOT_DESTROYED();
+  // Do not show scrollbars even if overflow:scroll is specified.
+  return false;
+}
+
 }  // namespace blink

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_single_line.h

@@ -37,6 +37,8 @@ class LayoutNGTextControlSingleLine final : public LayoutNGBlockFlow {
                    const HitTestLocation& hit_test_location,
                    const PhysicalOffset& accumulated_offset,
                    HitTestAction hit_test_action) override;
+
+  bool AllowsNonVisibleOverflow() const override;
 };
 
 }  // namespace blink