[CSSTypedOM] Computed StylePropertyMap use ComputedStyle for Lengths

third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp

Index: third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp b/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
index 878ed5be782d8eafcc60a19b7860cd0610b84958..8fc937d6d4ca9cad128ebbe31a25e4263b652657 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
@@ -68,6 +68,16 @@ CSSCalcLength* CSSCalcLength::create(const CSSCalcDictionary& dictionary, Except
     return result;
 }
 
+CSSCalcLength* CSSCalcLength::fromLength(const Length& length)
+{
+    DCHECK(length.isCalculated());
+    PixelsAndPercent values = length.getPixelsAndPercent();
+    CSSCalcLength* result = new CSSCalcLength();
+    result->set(values.pixels, CSSPrimitiveValue::UnitType::Pixels);
+    result->set(values.percent, CSSPrimitiveValue::UnitType::Percentage);
+    return result;
+}
+
 bool CSSCalcLength::containsPercent() const
 {
     return has(CSSPrimitiveValue::UnitType::Percentage);