Implement frames() timing function

third_party/WebKit/Source/core/animation/TimingInputTest.cpp

Index: third_party/WebKit/Source/core/animation/TimingInputTest.cpp
diff --git a/third_party/WebKit/Source/core/animation/TimingInputTest.cpp b/third_party/WebKit/Source/core/animation/TimingInputTest.cpp
index de16c6678a6b52f5fdacf005ede6135c8b98cc41..de1fb62fc3d1410190bf19999212af4eaeaf0de8 100644
--- a/third_party/WebKit/Source/core/animation/TimingInputTest.cpp
+++ b/third_party/WebKit/Source/core/animation/TimingInputTest.cpp
@@ -321,6 +321,11 @@ TEST(AnimationTimingInputTest, TimingInputTimingFunction) {
                               success)
            .timingFunction);
   EXPECT_TRUE(success);
+  EXPECT_EQ(
+      *FramesTimingFunction::create(5),
+      *applyTimingInputString(scope.isolate(), "easing", "frames(5)", success)
+           .timingFunction);
+  EXPECT_TRUE(success);
 
   applyTimingInputString(scope.isolate(), "easing", "", success);
   EXPECT_FALSE(success);
@@ -329,6 +334,11 @@ TEST(AnimationTimingInputTest, TimingInputTimingFunction) {
   applyTimingInputString(scope.isolate(), "easing",
                          "cubic-bezier(2, 2, 0.3, 0.3)", success);
   EXPECT_FALSE(success);
+  applyTimingInputString(scope.isolate(), "easing", "frames(1)", success);
+  EXPECT_FALSE(success);
+  applyTimingInputString(scope.isolate(), "easing", "frames(3, start)",
+                         success);
+  EXPECT_FALSE(success);
   applyTimingInputString(scope.isolate(), "easing", "rubbish", success);
   EXPECT_FALSE(success);
   applyTimingInputNumber(scope.isolate(), "easing", 2, success);