DCHECK style is cacheable in ComputedStyle::CopyNonInheritedFromCached.

third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.cpp

Index: third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.cpp b/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.cpp
index bfb82c11512373e37858899761c350ae954dea29..4a2cc79092c3b7a2746b3c92a0547645acae7ee0 100644
--- a/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.cpp
@@ -117,25 +117,35 @@ void MatchedPropertiesCache::ClearViewportDependent() {
   cache_.RemoveAll(to_remove);
 }
 
-bool MatchedPropertiesCache::IsCacheable(const StyleResolverState& state) {
-  const ComputedStyle& style = *state.Style();
-  const ComputedStyle& parent_style = *state.ParentStyle();
-
-  if (style.Unique() ||
-      (style.StyleType() != kPseudoIdNone && parent_style.Unique()))
+bool MatchedPropertiesCache::IsStyleCacheable(const ComputedStyle& style) {
+  // unique() styles are not cacheable.
+  if (style.Unique())
     return false;
   if (style.Zoom() != ComputedStyle::InitialZoom())
     return false;
   if (style.GetWritingMode() != ComputedStyle::InitialWritingMode() ||
       style.Direction() != ComputedStyle::InitialDirection())
     return false;
+  // styles with non inherited properties that reference variables are not
+  // cacheable.
+  if (style.HasVariableReferenceFromNonInheritedProperty())
+    return false;
+  return true;
+}
+
+bool MatchedPropertiesCache::IsCacheable(const StyleResolverState& state) {
+  const ComputedStyle& style = *state.Style();
+  const ComputedStyle& parent_style = *state.ParentStyle();
+
+  if (!IsStyleCacheable(style))
+    return false;
+  if (style.StyleType() != kPseudoIdNone && parent_style.Unique())
+    return false;
   // The cache assumes static knowledge about which properties are inherited.
   // Without a flat tree parent, StyleBuilder::ApplyProperty will not
   // SetHasExplicitlyInheritedProperties on the parent style.
   if (!state.ParentNode() || parent_style.HasExplicitlyInheritedProperties())
     return false;
-  if (style.HasVariableReferenceFromNonInheritedProperty())
-    return false;
   return true;
 }