Web Animations: Compositor start notification should only apply to animations in a matching group

Source/core/animation/Animation.cpp

Index: Source/core/animation/Animation.cpp
diff --git a/Source/core/animation/Animation.cpp b/Source/core/animation/Animation.cpp
index 2068f0df9e7ce663dffd95caa3fe729f2eb48977..4ab8de4f2b4072b09ad5c20bb46442042bb6ffae 100644
--- a/Source/core/animation/Animation.cpp
+++ b/Source/core/animation/Animation.cpp
@@ -253,19 +253,14 @@ bool Animation::isCandidateForAnimationOnCompositor(double playerPlaybackRate) c
     return CompositorAnimations::instance()->isCandidateForAnimationOnCompositor(specifiedTiming(), *effect(), playerPlaybackRate);
 }
 
-bool Animation::maybeStartAnimationOnCompositor(double startTime, double currentTime)
-{
-    return maybeStartAnimationOnCompositor(startTime, currentTime, 1);
-}
-
-bool Animation::maybeStartAnimationOnCompositor(double startTime, double currentTime, double playerPlaybackRate)
+bool Animation::maybeStartAnimationOnCompositor(int group, double startTime, double currentTime, double playerPlaybackRate)
 {
     ASSERT(!hasActiveAnimationsOnCompositor());
     if (!isCandidateForAnimationOnCompositor(playerPlaybackRate))
         return false;
     if (!CompositorAnimations::instance()->canStartAnimationOnCompositor(*m_target))
         return false;
-    if (!CompositorAnimations::instance()->startAnimationOnCompositor(*m_target, startTime, currentTime, specifiedTiming(), *effect(), m_compositorAnimationIds, playerPlaybackRate))
+    if (!CompositorAnimations::instance()->startAnimationOnCompositor(*m_target, group, startTime, currentTime, specifiedTiming(), *effect(), m_compositorAnimationIds, playerPlaybackRate))
         return false;
     ASSERT(!m_compositorAnimationIds.isEmpty());
     return true;