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

third_party/WebKit/Source/core/animation/AnimationTest.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 55 matching lines @@
 
   KeyframeEffect* makeAnimation(double duration = 30, double playbackRate = 1) {
     Timing timing;
     timing.iterationDuration = duration;
     timing.playbackRate = playbackRate;
     return KeyframeEffect::create(0, nullptr, timing);
   }
 
   bool simulateFrame(double time) {
     document->animationClock().updateTime(time);
-    document->compositorPendingAnimations().update(false);
+    document->compositorPendingAnimations().update(
+        Optional<CompositorElementIdSet>(), false);
     // The timeline does not know about our animation, so we have to explicitly
     // call update().
     return animation->update(TimingUpdateForAnimationFrame);
   }
 
   Persistent<Document> document;
   Persistent<AnimationTimeline> timeline;
   Persistent<Animation> animation;
   std::unique_ptr<DummyPageHolder> pageHolder;
 };
@@ skipping 689 matching lines @@
   EXPECT_EQ(Animation::Idle, animation->playStateInternal());
   EXPECT_TRUE(std::isnan(animation->currentTime()));
   EXPECT_TRUE(std::isnan(animation->startTime()));
   animation->pause();
   EXPECT_EQ(Animation::Pending, animation->playStateInternal());
   EXPECT_EQ(0, animation->currentTime());
   EXPECT_TRUE(std::isnan(animation->startTime()));
 }
 
 }  // namespace blink