RubyNG+FragmentItem: Fix annotation space computation

With FragmentItem, a NGLogicalLineItems contains an InlineBox wrapping
a RubyRun.  It should be skipped on annotation space computation.

Bug: 1102887
Change-Id: Ia2b5f61090e9cd1a66e9415c64bcc2ea2c90efe1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288937
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786669}

third_party/blink/renderer/core/layout/ng/inline/ng_ruby_utils.cc

@@ -260,6 +260,8 @@ NGAnnotationMetrics ComputeAnnotationOverflow(
               else if (overflow > LayoutUnit())
                 has_under_annotation = true;
             }
+          } else if (item.IsInlineBox()) {
+            continue;
           }
         }
         content_over = std::min(content_over, item_over);

third_party/blink/web_tests/FlagExpectations/layout-ng-fragment-item

@@ -59,7 +59,6 @@ crbug.com/982194 external/wpt/webrtc/simulcast/h264.https.html [ Failure ]
 crbug.com/982194 external/wpt/webvtt/rendering/cues-with-video/processing-model/cue_too_long.html [ Failure Pass ]
 crbug.com/982194 external/wpt/webvtt/rendering/cues-with-video/processing-model/dom_override_remove_cue_while_paused.html [ Failure Pass ]
 crbug.com/982194 fast/scrolling/document-level-touchmove-event-listener-passive-by-default.html [ Failure Pass ]
-crbug.com/1102887 fast/ruby/ruby-position-modern-japanese-fonts.html [ Failure ]
 crbug.com/982194 http/tests/security/mixedContent/insecure-css-resources.html [ Failure Pass ]
 crbug.com/982194 inspector-protocol/media/media-player.js [ Pass ]
 crbug.com/1061102 media/picture-in-picture/v2/detached-iframe.html [ Skip ]