getComputedStyle() should return used value for 'line-height'

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index 31ac24aa956778860b7b74b2639ba2d1d366c9d9..fa169158b81c529d37f765e06af04bba1d8c60e4 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -1351,6 +1351,21 @@ Length ComputedStyle::lineHeight() const
 
 void ComputedStyle::setLineHeight(const Length& specifiedLineHeight) { SET_VAR(inherited, line_height, specifiedLineHeight); }
 
+float ComputedStyle::floatComputedLineHeight() const
+{
+    const Length& lh = lineHeight();
+
+    // Negative value means the line height is not set. Use the font's built-in
+    // spacing, if avalible.
+    if (lh.isNegative() && font().primaryFont())
+        return getFontMetrics().lineSpacing();
+
+    if (lh.hasPercent())
+        return minimumValueForLength(lh, LayoutUnit(computedFontSize()));
+
+    return std::min(lh.value(), LayoutUnit::max().toFloat());
+}
+
 int ComputedStyle::computedLineHeight() const
 {
     const Length& lh = lineHeight();