[SPv2] Decomposite otherwise-compositable animations that paint nothing.

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/animation/EffectStack.h"
 
 #include "core/animation/AnimationClock.h"
 #include "core/animation/CompositorPendingAnimations.h"
 #include "core/animation/DocumentTimeline.h"
 #include "core/animation/ElementAnimations.h"
@@ skipping 157 matching lines @@
 TEST_F(AnimationEffectStackTest, ForwardsFillDiscarding) {
   play(makeKeyframeEffect(
            makeEffectModel(CSSPropertyFontSize, AnimatableDouble::create(1))),
        2);
   play(makeKeyframeEffect(
            makeEffectModel(CSSPropertyFontSize, AnimatableDouble::create(2))),
        6);
   play(makeKeyframeEffect(
            makeEffectModel(CSSPropertyFontSize, AnimatableDouble::create(3))),
        4);
-  document->compositorPendingAnimations().update();
+  document->compositorPendingAnimations().update(
+      Optional<CompositorElementIdSet>());
   ActiveInterpolationsMap interpolations;
 
   updateTimeline(11);
   ThreadState::current()->collectAllGarbage();
   interpolations = EffectStack::activeInterpolations(
       &element->elementAnimations()->effectStack(), nullptr, nullptr,
       KeyframeEffectReadOnly::DefaultPriority);
   EXPECT_EQ(1u, interpolations.size());
   EXPECT_TRUE(interpolationValue(interpolations, CSSPropertyFontSize)
                   ->equals(AnimatableDouble::create(3).get()));
@@ skipping 24 matching lines @@
   interpolations = EffectStack::activeInterpolations(
       &element->elementAnimations()->effectStack(), nullptr, nullptr,
       KeyframeEffectReadOnly::DefaultPriority);
   EXPECT_EQ(1u, interpolations.size());
   EXPECT_TRUE(interpolationValue(interpolations, CSSPropertyFontSize)
                   ->equals(AnimatableDouble::create(3).get()));
   EXPECT_EQ(1u, sampledEffectCount());
 }
 
 }  // namespace blink