[CSS Typed OM] Hook up getting CSSUnitValues from inline StylePropertyMaps

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/cssom/CSSNumericValue.h"
 
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/cssom/CSSUnitValue.h"
+
 namespace blink {
 
 CSSNumericValue* CSSNumericValue::parse(const String& css_text,
                                         ExceptionState&) {
   // TODO(meade): Implement
   return nullptr;
 }
 
+CSSNumericValue* CSSNumericValue::FromCSSValue(const CSSPrimitiveValue& value) {
+  if (value.IsCalculated()) {
+    // TODO(meade): Implement this case.
+    return nullptr;
+  }
+  return CSSUnitValue::FromCSSValue(value);
+}
+
 }  // namespace blink