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 630f9e93f2f751111913912ab45dfaaa3e00ef71..5e9f6d8c477587c347a291a0f924a25f7a6e59a8 100644
--- a/third_party/WebKit/Source/core/animation/TimingInputTest.cpp
+++ b/third_party/WebKit/Source/core/animation/TimingInputTest.cpp
@@ -329,6 +329,11 @@ TEST(AnimationTimingInputTest, TimingInputTimingFunction) {
                               success)
            .timing_function);
   EXPECT_TRUE(success);
+  EXPECT_EQ(*FramesTimingFunction::Create(5),
+            *ApplyTimingInputString(scope.GetIsolate(), "easing", "frames(5)",
+                                    success)
+                 .timing_function);
+  EXPECT_TRUE(success);
 
   ApplyTimingInputString(scope.GetIsolate(), "easing", "", success);
   EXPECT_FALSE(success);
@@ -338,6 +343,11 @@ TEST(AnimationTimingInputTest, TimingInputTimingFunction) {
   ApplyTimingInputString(scope.GetIsolate(), "easing",
                          "cubic-bezier(2, 2, 0.3, 0.3)", success);
   EXPECT_FALSE(success);
+  ApplyTimingInputString(scope.GetIsolate(), "easing", "frames(1)", success);
+  EXPECT_FALSE(success);
+  ApplyTimingInputString(scope.GetIsolate(), "easing", "frames(3, start)",
+                         success);
+  EXPECT_FALSE(success);
   ApplyTimingInputString(scope.GetIsolate(), "easing", "rubbish", success);
   EXPECT_FALSE(success);
   ApplyTimingInputNumber(scope.GetIsolate(), "easing", 2, success);