Implement frames() timing function

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

Index: third_party/WebKit/Source/core/css/CSSTimingFunctionValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSTimingFunctionValue.cpp b/third_party/WebKit/Source/core/css/CSSTimingFunctionValue.cpp
index 05e13afa3fccbebeb1ed24d39bafa127567706c1..8d2b5100a35ab61446f69a897a6c5e8ff60d5008 100644
--- a/third_party/WebKit/Source/core/css/CSSTimingFunctionValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSTimingFunctionValue.cpp
@@ -61,4 +61,13 @@ bool CSSStepsTimingFunctionValue::equals(
   return m_steps == other.m_steps && m_stepPosition == other.m_stepPosition;
 }
 
+String CSSFramesTimingFunctionValue::customCSSText() const {
+  return "frames(" + String::number(m_frames) + ")";
+}
+
+bool CSSFramesTimingFunctionValue::equals(
+    const CSSFramesTimingFunctionValue& other) const {
+  return m_frames == other.m_frames;
+}
+
 }  // namespace blink