Implement frames() timing function

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

Index: third_party/WebKit/Source/core/css/CSSValue.h
diff --git a/third_party/WebKit/Source/core/css/CSSValue.h b/third_party/WebKit/Source/core/css/CSSValue.h
index 015cdb1ad8361b849b185067dde141a31fcfd328..95f6874de7742588399907b095fdc06763f7f050 100644
--- a/third_party/WebKit/Source/core/css/CSSValue.h
+++ b/third_party/WebKit/Source/core/css/CSSValue.h
@@ -125,6 +125,9 @@ class CORE_EXPORT CSSValue : public GarbageCollectedFinalized<CSSValue> {
   bool isStepsTimingFunctionValue() const {
     return m_classType == StepsTimingFunctionClass;
   }
+  bool isFramesTimingFunctionValue() const {
+    return m_classType == FramesTimingFunctionClass;
+  }
   bool isGridTemplateAreasValue() const {
     return m_classType == GridTemplateAreasClass;
   }
@@ -197,6 +200,7 @@ class CORE_EXPORT CSSValue : public GarbageCollectedFinalized<CSSValue> {
     // Timing function classes.
     CubicBezierTimingFunctionClass,
     StepsTimingFunctionClass,
+    FramesTimingFunctionClass,
 
     // Other class types.
     BorderImageSliceClass,