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

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

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 254 matching lines @@
       EXPECT_EQ(to->offset(), 1.0);
     }
     if (!HasFatalFailure()) {
       return AnimatableValueKeyframeEffectModel::create(frames);
     }
     return nullptr;
   }
 
   void simulateFrame(double time) {
     m_document->animationClock().updateTime(time);
-    m_document->compositorPendingAnimations().update(false);
+    m_document->compositorPendingAnimations().update(
+        Optional<CompositorElementIdSet>(), false);
     m_timeline->serviceAnimations(TimingUpdateForAnimationFrame);
   }
 
   std::unique_ptr<CompositorAnimation> convertToCompositorAnimation(
       AnimatableValueKeyframeEffectModel& effect,
       double playerPlaybackRate) {
     Vector<std::unique_ptr<CompositorAnimation>> result;
     getAnimationOnCompositor(m_timing, effect, result, playerPlaybackRate);
     DCHECK_EQ(1U, result.size());
     return std::move(result[0]);
@@ skipping 1010 matching lines @@
 
   // Clearing the effect node entirely should also produce false.
   properties.clearEffect();
   EXPECT_FALSE(CompositorAnimations::canStartAnimationOnCompositor(*element));
 
   element->setLayoutObject(nullptr);
   LayoutObjectProxy::dispose(layoutObject);
 }
 
 }  // namespace blink