PurgeMemory.

third_party/WebKit/Source/core/css/CSSValue.cpp

Index: third_party/WebKit/Source/core/css/CSSValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSValue.cpp b/third_party/WebKit/Source/core/css/CSSValue.cpp
index 7a300481dfd2c3587c04a91a2b2da05c8964d00f..740abd80a1c56ae428b157da63f2bee274093eca 100644
--- a/third_party/WebKit/Source/core/css/CSSValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSValue.cpp
@@ -629,4 +629,16 @@ DEFINE_TRACE(CSSValue)
     ASSERT_NOT_REACHED();
 }
 
+void CSSValue::purgeMemory()
+{
+    if (isImageValue()) {
+        toCSSImageValue(this)->purgeMemory();
+        return;
+    }
+    if (isImageSetValue()) {
+        toCSSImageSetValue(this)->purgeMemory();
+        return;
+    }
+}
+
 } // namespace blink