BackgroundImage incorrectly returns empty url() when created on-the-fly

Source/core/css/CSSImageValue.cpp

Index: Source/core/css/CSSImageValue.cpp
diff --git a/Source/core/css/CSSImageValue.cpp b/Source/core/css/CSSImageValue.cpp
index 8be299fbac042f8635fb779080bdf87b7027f4f8..ce3c83c68259e5ef92933fd20cec4f59a902f4a8 100644
--- a/Source/core/css/CSSImageValue.cpp
+++ b/Source/core/css/CSSImageValue.cpp
@@ -108,7 +108,11 @@ bool CSSImageValue::equals(const CSSImageValue& other) const
 
 String CSSImageValue::customCSSText() const
 {
-    return "url(" + quoteCSSURLIfNeeded(m_absoluteURL) + ")";
+    // TODO (nainar): Currently the spec -> https://drafts.csswg.org/cssom/#serialize-a-string
+    // states that the serialized string in the URL should have quotation marks appended on
+    // both ends of the string. However, the layout tests currently do not expect that, hence
+    // we need another patch that fixes that. For now serializing without quotation marks

[alancutter (OOO until 2018), 2015/09/18 02:55:09]

This should be a one liner.
// TODO(nainar): Serialise with quotation marks to match spec:
https://drafts.csswg.org/cssom/#serialize-a-string

[nainar, 2015/09/18 03:47:25]

Done.

+    return "url(" + quoteCSSURLIfNeeded(serializeStringWithoutQuotations(m_relativeURL)) + ")";
 }
 
 bool CSSImageValue::knownToBeOpaque(const LayoutObject* layoutObject) const