Pseudo and non pseudo elements should return correct computed content value

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index adb73a602df75ebd5d50748f5c497c90c5da03b8..f087cc75932d69852f7f4a8c35ff58287132a1a6 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -926,6 +926,16 @@ void ComputedStyle::setContent(QuoteType quote, bool add)
     rareNonInheritedData.access()->m_content = ContentData::create(quote);
 }
 
+void ComputedStyle::setContent(CSSValueID cssValueID, bool add)
+{
+    if (add) {
+        appendContent(ContentData::create(cssValueID));
+        return;
+    }
+
+    rareNonInheritedData.access()->m_content = ContentData::create(cssValueID);
+}
+
 bool ComputedStyle::hasWillChangeCompositingHint() const
 {
     for (size_t i = 0; i < rareNonInheritedData->m_willChange->m_properties.size(); ++i) {