[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 c01581d0c21c582ff54aa1dafae273d52ee2d622..b7f2782b4ce6859dc8bde8f7048e2fc9f558e819 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
@@ -74,6 +74,15 @@ CSSCalcLength* CSSCalcLength::fromCSSValue(const CSSPrimitiveValue&) {
   return nullptr;
 }
 
+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);
 }