[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 4d1b56531ffb75d5eccf8ff7a707a615844f0faa..ea0b681c99627cbf3284abed712702f95814f4f9 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/CSSCalcLength.cpp
@@ -68,6 +68,24 @@ CSSCalcLength* CSSCalcLength::create(const CSSCalcDictionary& dictionary, Except
     return result;
 }
 
+CSSCalcLength* CSSCalcLength::fromLength(const Length* length)
+{
+    DCHECK(length->isSpecified());
+    PixelsAndPercent values = length->getPixelsAndPercent();
+    CSSCalcLength* result = new CSSCalcLength();
+    if (length->isFixed()) {
+        result->set(values.pixels, CSSPrimitiveValue::UnitType::Pixels);
+        return result;
+    }
+    if (length->isPercent()) {
+        result->set(values.percent, CSSPrimitiveValue::UnitType::Percentage);
+        return result;
+    }
+    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);