Fix invalid DCHECK for EmphasisMarkHeight

This patch fixes a case where |EmphasisMarkHeight| may return
zero. The same fix as r801476 crrev.com/c/2374918 but in a
different function.

Bug: 1124854
Change-Id: I987b91e4743a5856889d1e9ab5db6b020c1b373e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2395007
Auto-Submit: Koji Ishii <kojii@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804694}

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

@@ -338,7 +338,7 @@ base::Optional<PhysicalRect> NGInkOverflow::ComputeTextInkOverflow(
   if (style.GetTextEmphasisMark() != TextEmphasisMark::kNone) {
     LayoutUnit emphasis_mark_height =
         LayoutUnit(font.EmphasisMarkHeight(style.TextEmphasisMarkString()));
-    DCHECK_GT(emphasis_mark_height, LayoutUnit());
+    DCHECK_GE(emphasis_mark_height, LayoutUnit());
     if (style.GetTextEmphasisLineLogicalSide() == LineLogicalSide::kOver) {
       ink_overflow.ShiftYEdgeTo(
           std::min(ink_overflow.Y(), -emphasis_mark_height));