Make LayoutBox::ResolvedDirection() to utilize NGInlineCursor

This patch makes |LayoutBox::ResolvedDirection()| to utilize |NGInlineCursor|
for prepration of migrating to |NGFragmentItem|.

Bug: 982194
Change-Id: I4560959b10d83a2c9b2b50815921eaa37301a3b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1909671
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714170}

third_party/blink/renderer/core/layout/layout_box.cc

@@ -65,6 +65,7 @@
 #include "third_party/blink/renderer/core/layout/ng/custom/layout_worklet.h"
 #include "third_party/blink/renderer/core/layout/ng/custom/layout_worklet_global_scope_proxy.h"
 #include "third_party/blink/renderer/core/layout/ng/geometry/ng_box_strut.h"
+#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_cursor.h"
 #include "third_party/blink/renderer/core/layout/ng/ng_box_fragment.h"
 #include "third_party/blink/renderer/core/layout/ng/ng_box_fragment_builder.h"
 #include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.h"
@@ -6372,14 +6373,14 @@ float LayoutBox::VisualRectOutsetForRasterEffects() const {
 
 TextDirection LayoutBox::ResolvedDirection() const {
   if (IsInline() && IsAtomicInlineLevel()) {
-    const auto fragments = NGPaintFragment::InlineFragmentsFor(this);
-    if (fragments.IsInLayoutNGInlineFormattingContext()) {
-      if (!fragments.IsEmpty()) {
-        return fragments.front().PhysicalFragment().ResolvedDirection();
-      }
-    } else if (InlineBoxWrapper()) {
-      return InlineBoxWrapper()->Direction();
+    if (IsInLayoutNGInlineFormattingContext()) {
+      NGInlineCursor cursor;
+      cursor.MoveTo(*this);
+      if (cursor)
+        return cursor.CurrentResolvedDirection();
     }
+    if (InlineBoxWrapper())
+      return InlineBoxWrapper()->Direction();
   }
   return StyleRef().Direction();
 }