Chrome not considering Underline Position from Font

Source/core/rendering/InlineTextBox.cpp

Index: Source/core/rendering/InlineTextBox.cpp
diff --git a/Source/core/rendering/InlineTextBox.cpp b/Source/core/rendering/InlineTextBox.cpp
index d36b8b4c49f6af4c5c4e2853ac0735c81c511ac1..7f5d7cb761494296b6ef6326460624776177bb50 100644
--- a/Source/core/rendering/InlineTextBox.cpp
+++ b/Source/core/rendering/InlineTextBox.cpp
@@ -910,7 +910,17 @@ static int computeUnderlineOffset(const TextUnderlinePosition underlinePosition,
 {
     // Compute the gap between the font and the underline. Use at least one
     // pixel gap, if underline is thick then use a bigger gap.
-    const int gap = std::max<int>(1, ceilf(textDecorationThickness / 2.f));
+    int gap = 0;
+
+    // Underline position of zero means draw underline on Baseline Position,
+    // in Blink we need at least 1-pixel gap to adding following check.
+    // Positive underline Position means underline should be drawn above baseline
+    // and negative value means drawing below baseline, negating the value as in Blink
+    // downward Y-increases.
+    if (fontMetrics.underlinePosition())
+        gap = -fontMetrics.underlinePosition();
+    else
+        gap = std::max<int>(1, ceilf(textDecorationThickness / 2.f));
 
     // FIXME: We support only horizontal text for now.
     switch (underlinePosition) {