[CSS Typed OM] Implement support for CSSValue -> CSSCalcLength

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

Index: third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
diff --git a/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp b/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
index 065656944d8ea8ce30a1f4482fee828e663e099a..e42c5e63ba43535721543535604831720457fa43 100644
--- a/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/StyleValueFactory.cpp
@@ -6,8 +6,10 @@
 
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSValue.h"
+#include "core/css/cssom/CSSCalcLength.h"
 #include "core/css/cssom/CSSKeywordValue.h"
 #include "core/css/cssom/CSSNumberValue.h"
+#include "core/css/cssom/CSSOMTypes.h"
 #include "core/css/cssom/CSSSimpleLength.h"
 #include "core/css/cssom/CSSStyleValue.h"
 #include "core/css/cssom/CSSStyleVariableReferenceValue.h"
@@ -38,6 +40,13 @@ CSSStyleValue* createStyleValueWithPropertyInternal(CSSPropertyID propertyID,
       // TODO(meade): Implement other properties.
       break;
   }
+  if (value.isPrimitiveValue() && toCSSPrimitiveValue(value).isCalculated()) {
+    // TODO(meade): Handle other calculated types, e.g. angles here.
+    if (CSSOMTypes::propertyCanTakeType(propertyID,
+                                        CSSStyleValue::CalcLengthType)) {
+      return CSSCalcLength::fromCSSValue(toCSSPrimitiveValue(value));
+    }
+  }
   return nullptr;
 }