Implement frames() timing function

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

Index: third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
diff --git a/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp b/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
index 5cc354ea185965c68aba38080b859dd2a56ad7ad..b4c71135254077f5fb8dd0d7490701efd6800ae8 100644
--- a/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
+++ b/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
@@ -66,6 +66,7 @@ class AnimationCompositorAnimationsTest : public ::testing::Test {
   RefPtr<TimingFunction> m_cubicEaseTimingFunction;
   RefPtr<TimingFunction> m_cubicCustomTimingFunction;
   RefPtr<TimingFunction> m_stepTimingFunction;
+  RefPtr<TimingFunction> m_framesTimingFunction;
 
   Timing m_timing;
   CompositorAnimations::CompositorTiming m_compositorTiming;
@@ -86,6 +87,7 @@ class AnimationCompositorAnimationsTest : public ::testing::Test {
     m_cubicCustomTimingFunction = CubicBezierTimingFunction::create(1, 2, 3, 4);
     m_stepTimingFunction =
         StepsTimingFunction::create(1, StepsTimingFunction::StepPosition::END);
+    m_framesTimingFunction = FramesTimingFunction::create(2);
 
     m_timing = createCompositableTiming();
     m_compositorTiming = CompositorAnimations::CompositorTiming();
@@ -605,6 +607,15 @@ TEST_F(AnimationCompositorAnimationsTest,
 }
 
 TEST_F(AnimationCompositorAnimationsTest,
+       isCandidateForAnimationOnCompositorTimingFunctionFrames) {
+  m_timing.timingFunction = m_framesTimingFunction;
+  EXPECT_TRUE(isCandidateForAnimationOnCompositor(m_timing,
+                                                  *m_keyframeAnimationEffect2));
+  EXPECT_TRUE(isCandidateForAnimationOnCompositor(m_timing,
+                                                  *m_keyframeAnimationEffect5));
+}
+
+TEST_F(AnimationCompositorAnimationsTest,
        isCandidateForAnimationOnCompositorTimingFunctionChainedLinear) {
   EXPECT_TRUE(isCandidateForAnimationOnCompositor(m_timing,
                                                   *m_keyframeAnimationEffect2));
@@ -674,23 +685,29 @@ TEST_F(AnimationCompositorAnimationsTest,
 }
 
 TEST_F(AnimationCompositorAnimationsTest,
-       isCandidateForAnimationOnCompositorTimingFunctionWithStepOkay) {
+       isCandidateForAnimationOnCompositorTimingFunctionWithStepOrFrameOkay) {
   (*m_keyframeVector2)[0]->setEasing(m_stepTimingFunction.get());
   m_keyframeAnimationEffect2 =
       AnimatableValueKeyframeEffectModel::create(*m_keyframeVector2);
   EXPECT_TRUE(isCandidateForAnimationOnCompositor(m_timing,
                                                   *m_keyframeAnimationEffect2));
 
+  (*m_keyframeVector2)[0]->setEasing(m_framesTimingFunction.get());
+  m_keyframeAnimationEffect2 =
+      AnimatableValueKeyframeEffectModel::create(*m_keyframeVector2);
+  EXPECT_TRUE(isCandidateForAnimationOnCompositor(m_timing,
+                                                  *m_keyframeAnimationEffect2));
+
   (*m_keyframeVector5)[0]->setEasing(m_stepTimingFunction.get());
   (*m_keyframeVector5)[1]->setEasing(m_linearTimingFunction.get());
   (*m_keyframeVector5)[2]->setEasing(m_cubicEaseTimingFunction.get());
-  (*m_keyframeVector5)[3]->setEasing(m_linearTimingFunction.get());
+  (*m_keyframeVector5)[3]->setEasing(m_framesTimingFunction.get());
   m_keyframeAnimationEffect5 =
       AnimatableValueKeyframeEffectModel::create(*m_keyframeVector5);
   EXPECT_TRUE(isCandidateForAnimationOnCompositor(m_timing,
                                                   *m_keyframeAnimationEffect5));
 
-  (*m_keyframeVector5)[0]->setEasing(m_linearTimingFunction.get());
+  (*m_keyframeVector5)[0]->setEasing(m_framesTimingFunction.get());
   (*m_keyframeVector5)[1]->setEasing(m_stepTimingFunction.get());
   (*m_keyframeVector5)[2]->setEasing(m_cubicEaseTimingFunction.get());
   (*m_keyframeVector5)[3]->setEasing(m_linearTimingFunction.get());
@@ -700,7 +717,7 @@ TEST_F(AnimationCompositorAnimationsTest,
                                                   *m_keyframeAnimationEffect5));
 
   (*m_keyframeVector5)[0]->setEasing(m_linearTimingFunction.get());
-  (*m_keyframeVector5)[1]->setEasing(m_cubicEaseTimingFunction.get());
+  (*m_keyframeVector5)[1]->setEasing(m_framesTimingFunction.get());
   (*m_keyframeVector5)[2]->setEasing(m_cubicEaseTimingFunction.get());
   (*m_keyframeVector5)[3]->setEasing(m_stepTimingFunction.get());
   m_keyframeAnimationEffect5 =